NEET Phase-II (24-07-2016) Biology Solution {Code – XX}

NEET Phase-II Biology solution

Code – XX

Date – 24-07-2016

 

  1. A foreign DNA and plasmid cut by the samerestriction endonuclease can be joined toform a recombinant plasmid using
    1. ligase
    2. Eco RI
    3. Taq polymerase
    4. polymerase III

Ans.        (1) Ligase                                                                              [NCERT class 12, page 197]      

 

  1. Which of the following is not a component ofdownstream processing?
    1. Expression
    2. Separation
    3. Purification
    4. Preservation

Ans.        (1) Expression                                                  [NCERT class 12, page 205]

 

  1. Which of the following restriction enzymesproduces blunt ends?
    1. Hind III
    2. Sal I
    3. Eco RV
    4. Xho I

Ans.        (3) Eco RV

 

  1. Which kind of therapy was given in 1990 to afour-year-old girl with adenosine deaminase(ADA) deficiency?
    1. Radiation therapy
    2. Gene therapy
    3. Chemotherapy
    4. Immunotherapy

Ans.        (2) Gene therapy                                                                      [NCERT class 12, page 211]

 

  1. How many hot spots of biodiversity in theworld have been identified till date byNorman Myers?
    1. 43
    2. 17
    3. 25
    4. 34

Ans.        (4) 34                                                                            [NCERT class 12, page 266]

 

  1. The primary producers of the deep-seahydrothermal vent ecosystem are
    1. coral reefs
    2. green algae
    3. chemosynthetic bacteria
    4. blue-green algae

Ans.        (3) chemosynthetic bacteria                                             [NCERT class 12, page 226]

  

  1. Which of the following is correct forr-selected species?
    1. Small number of progeny with large size
    2. Large number of progeny with small size
    3. Large number of progeny with large size
    4. Small number of progeny with small size

Ans.        (2) Large number of progeny with small size

 

  1. If’+’ sign is assigned to beneficial interaction, ‘-’ sign to detrimental and ‘0’ sign to neutralinteraction, then the population interactionrepresented by ‘+’ refers to
    1. parasitism
    2. mutualism
    3. amensalism
    4. commensalism

Ans.        (1) parasitism                                                [NCERT class 12, page 232]

 

  1. Which of the following is correctly matched?
    1. Stratification—Population
    2. Aerenchyma—Opuntia
    3. Age pyramid—Biome
    4. Parthenium hysterophorus—Threat to biodiversity

Ans.        (4) Parthenium hysterophorus—Threat to biodiversity                                        [NCERT class 12, page 265]

 

  1. Red List contains data or information on
    1. marine vertebrates only
    2. all economically important plant
    3. plants whose products are ininternational trade
    4. threatened species

Ans.        (4) threatened species                                                           [NCERT class 12, page 263]

 

  1. Which one of the following is wrongfor fungi?
    1. They are both unicellular and
    2. They are eukaryotic.
    3. All fungi possess a purely cellulosic cell wall.
    4. They are heterotrophic

Ans.        (3) All fungi possess a purely cellulosic cell wall                                                        [NCERT class 11, page 22]

 

  1. Methanogens belong to
    1. Slime moulds
    2. Eubacteria
    3. Archaebacteria
    4. Dinoflagellates

Ans.        (3) Archaebacteria                                                             [NCERT class 11, page 19]

 

  1. Select thewrong
    1. Diatoms are microscopic and floatpassively in water.
    2. The walls of diatoms are easily
    3. ‘Diatomaceous earth’ is formed by thecell walls of diatoms.
    4. Diatoms are chief producers in the

Ans.        (2) The walls of diatoms are easily destructible.            [NCERT class 11, page 20]

 

 

  1. The label of a herbarium sheetdoes not carry information on
    1. height of the plant
    2. date of collections
    3. name of collector
    4. local names

Ans.        (1) height of the plant                                                           [NCERT class 11, page 12]

 

  1. Conifers are adapted to tolerate extremeenvironmental conditions because of
    1. presence of vessels
    2. broad hardy leaves
    3. superficial stomata
    4. thick cuticle

Ans.        (4) thick cuticle                                                              [NCERT class 11, page 38]

 

  1. which one of the following statements iswrong?
    1. Laminaria and Sargassum are used as
    2. Algae increase the level of dissolved oxygen in the immediate environment.
    3. Algin is obtained from red algae, andcarrageenan from brown algae.
    4. Agar-agar is obtained from Gelidium and

Ans.        (3) Algin is obtained from red algae, and carrageenan from brown algae   [NCERT class 11, page 32]

 

  1. The term ‘polyadelphous’ is related to
    1. calyx
    2. gynoecium
    3. androecium
    4. corolla

Ans.        (3) androecium                                                                   [NCERT class 11, page 75]

 

  1. How many plants among, indigophera, Sesbania, Salvia, Allium, Aloe, Mustard, Groundnut, Radish, Gram, and Turnip have stamens with different lengths in their flowers?
    1. six
    2. Three
    3. Four
    4. Five

Ans.        (3) Four (Salvia, Mustard, Radish, Turnip)              [NCERT class 11, page 75]

 

  1. Radial symmetry is found in the flowers of
    1. Cassia
    2. Brassica
    3. Trifolium
    4. Pisum

Ans.        (2) Brassica                                                              [NCERT class 11, page 72,79]

 

  1. Free-central placentation is found in
    1. Citrus
    2. Dianthus
    3. Argemone
    4. Brassica

Ans.        (2) Dianthus                                                                      [NCERT class 11, page 75]

 

 

  1. Cortex is the region found between
    1. endodermis and vascular bundle
    2. epidermis and stele
    3. pericycle and endodermis
    4. endodermis and pith

Ans.        (2) epidermis and stele                                              [NCERT class 11, page 91]

 

  1. The balloon-shaped structures called tyloses
    1. are linked to the ascent of sap through xylem vessels
    2. originate in the lumen of vessels
    3. Characterize the sapwood
    4. are extensions of xylem parenchyma cells into vessels

Ans.        (4) are extensions of xylem parenchyma cells into vessels

 

  1. A non-proteinaceous enzyme is
    1. deoxyribonuclease
    2. lysozyme
    3. ribozyme
    4. ligase

Ans.        (3) ribozyme                                                                    [NCERT class 11, page 154]

 

  1. Select the
    1. Methanogens—Prokaryote
    2. Gas vacuoles—Green bacteria
    3. Large central vacuoles—Animal cells
    4. Protists—Eukaryotes

Ans.        (3) Large central vacuoles—Animal cells            [NCERT class 11, page 129]

 

  1. Select the wrong
    1. Mycoplasma is a wall-less
    2. Bacterial cell wall is made up of
    3. Pili and fimbriae are mainly involved inmotility of bacterial cells.
    4. Cyanobacteria lack flagellated cells.

Ans.        (3) Pili and fimbriae are mainly involved in motility of bacterial cells           [NCERT class 11, page 129]

 

  1. A cell organelle containing hydrolyticenzymes is
    1. mesosome
    2. lysosome
    3. microsome
    4. ribosome

Ans.        (2) lysosomes                                                                  [NCERT class 11, page 134]

 

  1. During cell growth, DNA synthesis takesplace in
    1. M phase
    2. S phase
    3. G1 phase
    4. G2 phase

Ans.        (2) S phase                                                                        [NCERT class 11, page 163]

 

 

  1. Which of the following biomolecules iscommon to respiration-mediated breakdownof fats, carbohydrates and proteins?
    1. Acetyl CoA
    2. Glucose-6-phosphate
    3. Fructose 1,6-bisphosphate
    4. Pyruvic acid

Ans.        (1) Acetyl CoA                                                                 [NCERT class 11, page 236]

 

  1. A few drops of sap were collected by cuttingacross a plant stem by a suitable method.The sap was tested chemically. Which one ofthe following test results indicates that it isphloem sap?
    1. Absence of sugar
    2. Acidic
    3. Alkaline
    4. Low refractive index

Ans.        (3) Alkaline

 

  1. You are given a tissue with its potential fordifferentiation in an artificial culture. Whichof the following pairs of hormones would youadd to the medium to secure shoots as wellas roots?
    1. Gibberellin and abscisic acid
    2. IAA and gibberellins
    3. Auxin and cytokinin
    4. Auxin and abscisic acid

Ans.        (3) Auxin and cytokinin                                              [NCERT class 12, page 177]

 

  1. Phytochrome is a
    1. Chromoprotein
    2. Flavoprotein
    3. Glycoprotein
    4. Lipoprotein

Ans.        (1) Chromoprotein

 

  1. Which is essential for the growth of root tip?
    1. Mn
    2. Zn
    3. Fe
    4. Ca

Ans.        (2) Zn                                                                    [NCERT class 11, page 198,248]

 

  1. The process which makes major differencebetween C3 and C4 plants is
    1. respiration
    2. glycolysis
    3. Calvin cycle
    4. Photorespiration

Ans.        (4) Photorespiration                                                 [NCERT class 11, page 220]

 

  1. Which one of the following statements is not correct?
    1. Water hyacinth, growing in the standingwater, drains oxygen from water thatleads to the death of fishes.
    2. Offspring produced by the asexualreproduction are called clone.
    3. Microscopic, motile asexual reproductivestructures are called zoospores.
    4. In potato, banana and ginger, theplantlets arise from the internodespresent in the modified stem.

Ans.        (4) In potato, banana and ginger, the plantlets arise from the internodes present in the modified stem.                                                                                                                                                                        [NCERT class 12, page 8]

 

  1. Which one of the following generates newgenetic combinations leading to variation?
    1. Nucellar polyembryony
    2. Vegetative reproduction
    3. Parthenogenesis
    4. Sexual reproduction

Ans.        (4) Sexual reproduction                                             [NCERT class 12, page 38]

 

  1. Match Column—I with Column—II andselect the correct option using the codesgiven below:
  Column—I   Column—II
a. Pistils fused together (i) Gametogenesis
b. Formation of gametes (ii) Pistillate
c. Hyphae of higher Ascomycetes (iii) Syncarpous
d. Unisexual female flower (iv) Dikaryotic

Codes :

a             b              c                 d 

  1. (iii)            (i)            (iv)          (ii)
  2. (iv)             (iii)          (i)            (ii)
  3. (ii)            (i)            (iv)          (iii)
  4. (i)               (ii)           (iv)          (iii)

Ans.        (1) a-(iii), b-(i), c-(iv), d-(ii)                                        [NCERT class 11, page 23,75]

 

  1. In majority of angiosperms
    1. a small central cell is present in theembryo sac
    2. egg has a filiform apparatus
    3. there are numerous antipodal cells
    4. reduction division occurs in themegaspore mother cells

Ans.        (4) reduction division occurs in the megaspore mother cells                               [NCERT class 12, page 26,27]

 

  1. Pollination in water hyacinth and water lily isbrought about by the agency of
    1. Bats
    2. Water
    3. insects or wind
    4. birds

Ans.     (3) insects or wind                                                                                                [NCERT class 12, page 29]

 

  1. The ovule of an angiosperm is technicallyequivalent to
    1. megaspore
    2. megasporangium
    3. megasporophyll
    4. megaspore mother cell

Ans.     (2) megasporangium                                               [NCERT class 12, page 25]

 

  1. Taylor conducted the experiments to provesemiconservative mode of chromosomereplication on
    1. coli
    2. Vinca rosea
    3. Vicia faba
    4. Drosophila melanogaster

Ans.     (3) Vicia faba                                                              [NCERT class 12, page 106]

 

  1. The mechanism that causes a gene to movefrom one linkage group to another is called
    1. crossing-over
    2. inversion
    3. duplication
    4. translocation

Ans.     (4) translocation

 

  1. The equivalent of a structural gene is
    1. recon
    2. muton
    3. cistron
    4. operon

Ans.     (3) Cistron                                                                    [NCERT class 12, page 109]

 

  1. A true breeding plant is
    1. always homozygous recessive in itsgenetic constitution
    2. one that is able to breed on its own
    3. produced due to cross-pollination amongunrelated plant
    4. near homozygous and produces offspringof its own kind

Ans.     (4) near homozygous and produces offspring of its own kind                   [NCERT class 12, page 70]

 

  1. Which of the following rRNAs acts asstructural RNA as well as ribozyme inbacteria?
    1. 8 S rRNA
    2. 5 S rRNA
    3. 18 S rRNA
    4. 23 S rRNA

Ans.     (4) 23 S rRNA                                                                              [NCERT class 12, page 115]

 

  1. Stirred-tank bioreactors have been designedfor
    1. ensuring anaerobic conditions in theculture vessel
    2. purification of product
    3. addition of preservatives to the product
    4. availability of oxygen throughout theprocess

Ans.     (4) availability of oxygen throughout the process                                      [NCERT class 12, page 204]

 

  1. A molecule that can act as a genetic materialmust fulfill the traits given below, except
    1. it should provide the scope for slow changes that are required for evolution
    2. it should be able to express itself in theform of ‘Mendelian characters’
    3. it should be able to generate its replica
    4. it should be unstable structurally andchemically

Ans.     (4) it should be unstable structurally and chemically                         [NCERT class 12, page 103]

 

  1. DNA-dependent RNA polymerase catalyzestranscription on one strand of the DNAwhich is called the
    1. antistrand
    2. template strand
    3. coding strand
    4. alpha strand

Ans.     (2) template strand                                                  [NCERT class 12, page 108]

 

  1. Interspecific hybridization is the mating of
    1. more closely related individuals withinsame breed for 4-6 generations
    2. animals within same breed withouthaving common ancestors
    3. two different related species
    4. superior males and females of differentbreeds

Ans.     (3) two different related species                                         [NCERT class 12, page 168]

 

  1. which of the following is correctregardingAIDS causative agent HIV?
    1. HIV does not escape but attacks theacquired immune response.
    2. HIV is enveloped virus containing onemolecule of single-stranded RNA and onemolecule of reverse transcriptase.
    3. HIV is enveloped virus that contains twoidentical molecules of single-stranded RNA and two molecules of reverse
    4. HIV is unenveloped retrovirus.

Ans.     (3) HIV is enveloped virus that contains two identical molecules of single-stranded RNA and two molecules of reverse transcriptase                                                                

 

  1. Among the following edible fishes, whichone is a marine fish having rich source ofomega-3 fatty acids?
    1. Mackerel
    2. Mystus
    3. Mangur
    4. Mrigala

Ans.     (1) Mackerel                                                                  [NCERT class 12, page 169]

 

  1. Match Column—I with Column—II and select the correct option using the codesgiven below:

Column—I                              Column—II

  1. Citric acid                                (i)    Trichoderma
  2. Cyclosporin A                         (ii)   Clostridium
  3. Statins                                    (iii) Aspergillus
  4. Butyric acid                           (iv) Monascus

Codes :

a          b         c          d

  1. (iii)      (iv)     (i)        (ii)
  2. (iii)        (i)        (ii)       (iv)
  3. (iii)        (i)        (iv)     (ii)
  4. (i)          (iv)     (ii)       (iii)

Ans.     (3) a-(iii), b-(i), c-(iv), d-(ii)                                              [NCERT class 12, page 183]

 

  1. Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodiesreceiving effluents from.
    1. sugar industry
    2. domestic sewage
    3. dairy industry
    4. petroleum industry

Ans.     (4) petroleum industry                                                          [NCERT class 12, page 276]

 

  1. The principle of competitive exclusion wasstated by
    1. Verhulst and Pearl
    2. Darwin
    3. F. Gause
    4. MacArthur

Ans.     (3) G. F. Gause                                                           [NCERT class 12, page 234]

 

  1. Which of the following National Parks is home to the famous musk deer or hangul?
    1. Dachigam National Park, Jammu &Kashmir
    2. Keibul Lamjao National Park, Manipur
    3. Bandhavgarh National Park, MadhyaPradesh
    4. Eaglenest Wildlife Sanctuary, ArunachalPradesh

Ans.     (1) Dachigam National Park, Jammu & Kashmir                                                  

 

  1. A lake which is rich in organic waste mayresult in
    1. mortality of fish due to lack of oxygen
    2. increased population of aquaticorganisms due to minerals
    3. drying of the lake due to algal bloon
    4. increased population of fish due to lots ofnutrients

Ans.     (1) mortality of fish due to lack of oxygen                        [NCERT class 12, page 275]

 

  1. The highest DDT concentration in aquaticfood chain shall occur in
    1. eel
    2. phytoplankton
    3. seagull
    4. crab

Ans.     (3) seagull                                                                [NCERT class 12, page 276]

 

  1. Which-of the following sets of diseases iscaused by bacteria?
    1. Herpes and influenza
    2. Cholera and tetanus
    3. Typhoid and smallpox
    4. Tetanus and mumps

Ans.     (2) Cholera and tetanus                                               [NCERT class 11, page 26]

 

 

  1. Match Column—I with Column—II forhousefly classification and select the correctoption using the codes given below :

Column—I                      Column—II

  1. Family                   (i)   Diptera
  2. order                      (ii) Arthropoda
  3. Class                 (iii)  Muscidae
  4. Phylum                   (iv) Insecta

Codes :

a      b    c  d

  1.          (iv)    (ii)       (i)        (iii)
  2.         (iii)    (i)        (iv)      (ii)
  3.        (iii)     (ii)       (iv)      (i)
  4.       (iv)      (iii)      (ii)       (i)

Ans.     (2) a-(iii), b-(i), c-(iv), d-(ii).                                       [NCERT class 11, page 11]

 

  1. Choose the correct
    1. All Pisces have gills covered by an
    2. All mammals are viviparous.
    3. All cyclostomes do not possess jaws and paired fins.
    4. All reptiles have a three-chambered

Ans.     (3) All cyclostomes do not possess jaws and paired fins                      [NCERT class 11, page 56-59]

 

  1. Study the four statements (A-D) given belowand select the two correct ones out of them:
    1. Definition of biological species was givenby Ernst Mayr.
    2. Photoperiod does not affect reproductionin plants.
    3. Binomial nomenclature system wasgiven by R. H.
    4. In unicellular organisms, reproduction issynonymous with growth.

The two correctstatements are

(1) A and B                              (2) B and C                              (3) C and D                      (4) A and D

Ans.     (4) A and D                                                            [NCERT class 11, page 2-7]

 

  1. In male cockroaches, sperms are stored in which part of the reproductive system?
    1. Vas deferens
    2. Seminal vesicles
    3. Mushroom glands
    4. Testes

Ans.     (2) Seminal vesicles                                                                 [NCERT class 11, page 114]

 

  1. Smooth muscles are
    1. voluntary, spindle-shaped, uninucleate
    2. involuntary, fusiform, non-striated
    3. voluntry, multinucleate, cylindrical
    4. involuntary, cylindrical, striated

Ans.     (2) involuntary, fusiform, non-striated                    [NCERT class 11, page 105,303]

 

 

  1. Oxidative phosphorylation is
    1. formation of ATP by energy released from electrons removed during substrateoxidation
    2. formation of ATP by transfer ofphosphate group from a substrateto ADP
    3. oxidation of phosphate group in ATP
    4. addition of phosphate group to ATP

Ans.     (1) formation of ATP by energy released from electrons removed during substrate oxidation                                                                        [NCERT class 11, page 233]

 

  1. Which of the following is the least likely to beinvolved in stabilizing the three-dimensionalfolding of most proteins?
    1. Ester bonds
    2. Hydrogen bonds
    3. Electrostatic interaction
    4. Hydrophobic interaction

Ans.     (1) Ester bonds                                                 [NCERT class 11, page 150]

 

  1. Which of the following describes the given graph correctly?

1

  1. Exothermic reaction with energy A inabsence of enzyme and B in presence ofenzyme
  2. Endothermic reaction with energy A inpresence of enzyme and B in absence ofenzyme
  3. Exothermic reaction with energy A inpresence of enzyme and B in absence ofenzyme
  4. Endothermic reaction with energy A inabsence of enzyme and B in presence ofenzyme

Ans.     (3) Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme                                                                                       [NCERT class 11, page 156]

 

  1. When cell has stalled DNA replication fork,which checkpoint should be predominantlyactivated?
    1. Both G2/M and M
    2. G1/S
    3. G2/M
    4. M

Ans.     (2) G1/S                                                                         [NCERT class 11, page 164]

 

  1. Match the stages of meiosis in Column—I to their characteristic features in Column—II and select the correct option using the codes given below:
  Column—I   Column—II
a. Pachytene (i) Pairing of homologous chromosomes
b. Metaphase-I (ii) Terminalization of chiasmata
c. Diakinesis (iii) Crossing-over takes place
d. Zygotene (iv) Chromosomes align at equatorial plate

a          b         c          d

  1. (iv) (iii)      (ii)       (i)
  2. (iii) (iv)     (ii)       (i)
  3. (i) (iv)     (ii)       (iii)
  4. (ii) (iv)     (iii)      (i)

Ans.     (2) a-(iii), b-(iv), c-(ii), d-(i)                               [NCERT class 11, page 168]

 

  1. Which hormones do stimulate theproduction of pancreatic juice andbicarbonate?
    1. Insulin and glucagon
    2. Angiotensin and epinephrine
    3. Gastrin and insulin
    4. Cholecystokinin and secretin

Ans.     (4) Cholecystokinin and secretin                             [NCERT class 11, page 338]

 

  1. The partial pressure of oxygen in the alveoliof the lungs is
    1. less than that of carbon dioxide
    2. equal to that in the blood
    3. more than that in the blood
    4. less than that in the blood

Ans.     (3) more than that in the blood                                        [NCERT class 11, page 272]

 

  1. Choose the correct
    1. Receptors do not produce graded
    2. Nociceptors respond to changes in
    3. Meissner’s corpuscles are thermo­receptors.
    4. Photoreceptors in the human eye aredepolarized during darkness and becomehyperpolarized in response to the light

Ans.     (4) Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus.                          

 

  1. Graves’ disease is caused due to
    1. hypersecretion of adrenal gland
    2. hyposecretion of thyroid gland
    3. hypersecretion of thyroid gland
    4. hyposecretion of adrenal gland

Ans.     (3) hypersecretion of thyroid gland                                

 

 

  1. Name the ion responsible for unmasking ofactive sites for myosin for cross-bridgeactivity during muscle contraction.
    1. Potassium
    2. Calcium
    3. Magnesium
    4. Sodium

Ans.     (2) Calcium                                                     [NCERT class 11, page 307]

 

  1. Name the blood cells, whose reduction innumber can cause clotting disorder, leadingto excessive loss of blood from the
    1. Thrombocytes
    2. Erythrocytes
    3. Leucocytes
    4. Neutrophils

Ans.     (1) Thrombocyte                                                                   [NCERT class 11, page 280]

 

  1. Name a peptide hormone which acts mainlyon hepatocytes, adipocytes and enhancescellular glucose uptake and utilization.
    1. Gastrin
    2. Insulin
    3. Glucagon
    4. Secretin

Ans.     (2) Insulin                                                                   [NCERT class 11, page 336]

 

  1. Osteoporosis, an age-related disease ofskeletal system, may occur due to
    1. accumulation of uric acid leading toinflammation of joints
    2. immune disorder affecting neuro­muscular junction leading to fatigue
    3. high concentration of Ca++ and Na+
    4. decreased level of estrogen

Ans.     (4) decreased level of estrogen                                [NCERT class 11, page 312]

 

  1. Serum differs from blood in.
    1. lacking antibodies
    2. lacking globulins
    3. lacking albumins
    4. lacking clotting factors

Ans.     (4) lacking clotting factors                                          [NCERT class 11, page 279]

 

  1. Lungs do not collapse between breaths andsome air always remains in the lungs whichcan never be expelled because
    1. pressure in the lungs is higher than theatmospheric pressure.
    2. there is a negative pressure in the lungs
    3. there is a negative intrapleural pressure pulling at the lung walls
    4. there is a positive intrapleural pressure

Ans.     (3) there is a negative intrapleural pressure pulling at the lung walls       

 

  1. The posterior pituitary gland is nota trueendocrine gland because
    1. it secretes enzymes
    2. it is provided with a duct
    3. only stores and releases hormones
    4. it is under the regulation of hypo­thalamus

Ans.     (3) only stores and releases hormones                           [NCERT class 11, page 332]

 

  1. The part of nephron involved in activereabsorption of sodium is
    1. descending limb of Henle’s loop
    2. distal convoluted tubule
    3. proximal convoluted tubule
    4. Bowman’s capsule

Ans.     (3) proximal convoluted tubule                     [NCERT class 11, page 294]

 

  1. Which of the following is hormone-releasing IUD?
    1. Cu7
    2. LNG-20
    3. Multiload 375
    4. Lippes loop

Ans.     (2) LNG-20                                                                [NCERT class 12, page 60]

 

  1. Which of the following is incorrectregarding vasectomy?
    1. Irreversible sterility
    2. No sperm occurs in seminal fluid
    3. No sperm occurs in epididymis
    4. Vasa deferentia is cut and tied.

Ans.     (3) No sperm occurs in epididymis                                   [NCERT class 12, page 62]

 

  1. Embryo with more than 16 blastomeresformed due to in vitro fertilization istransferred into
    1. cervix
    2. uterus
    3. fallopian tube
    4. fimbriae

Ans.     (2) Uterus                                                                 [NCERT class 12, page 64]

 

  1. Which of the following depicts the correct pathway of transport of sperms?
    1. Efferent ductules →Rete testis → Vasdeferens → Epididymis
    2. Rete testis →Efferent ductules→ Epididymis → Vas deferens
    3. Rete testis → Epididymis → Efferentductules → Vas deferens
    4. Rete testis → Vas deferens → Efferentductules → Epididymis

Ans.     (2) Rete testis → Efferent ductules → Epididymis → Vas deferens             [NCERT class 12, page 43]

 

  1. Match Column—I with Column—II andselect the correct option using the codesgiven below :

ColumnI                              ColumnII

  1. Mons pubis (i)    Embryo formation
  2. Antrum (ii)   Sperm
  3. Trophectoderm (iii)  Female external genitalia
  4. Nebenkern (iv) Graafian follicle

Codes :

a          b        c          d

  1. (i) (iv)     (iii)      (ii)
  2. (iii) (iv)     (ii)       (i)
  3. (iii) (iv)     (i)        (ii)
  4. (iii) (i)        (iv)     (ii)

Ans.     (3) a-(iii), b-(iv), c-(i), d-(ii)                                 [NCERT class 12, page 46,48]

 

  1. Several hormones like hCG, hPL, estrogenprogesterone are produced by
    1. pituitary
    2. ovary
    3. placenta
    4. fallopian tube

Ans.     (3) placenta                                           [NCERT class 12, page 53]

 

  1. If a colour-blind man marries a woman whois homozygous for normal colour vision, the probability of their son being colour-blind is

(1) 1 (2)  0                                          (3)  5                              (4)  0.75

Ans.     (2) 0                                                                                   

 

  1. Genetic drift operates in
    1. slow reproductive population
    2. small isolated population
    3. large isolated population
    4. non-reproductive population

Ans.     (2) small isolated population                                               [NCERT class 12, page 137]

 

  1. In Hardy-Weinberg equation, the frequentof heterozygous individual is represented by-

(1) q2 (2) p2                                                              (3) 2pq                              (4) pq

Ans.     (3) 2pq                                                                               [NCERT class 12, page 137]

 

  1. The chronological order of human evolution/ from early to the recent is
    1. Australopithecus → Homo habilis → Ramapithecus → Homo erectus
    2. Australopithecus → Ramapithecus → Homo habilis → Homo erectus
    3. Ramapithecus → Australopithecus → Homo habilis → Homo erectus
    4. Ramapithecus → Homo habilis → Australopithecus → Homo erectus

Ans.     (3) Ramapithecus → Australopithecus → Homo habilis → Homo erectus  [NCERT class 12, page 140]

 

  1. Which of the following is the correct sequence of events in the origin of life?

I- Formation of protobionts

II-Synthesis of organic monomers

III-Synthesis of organic polymers

IV-Formation of DNA-based genetic system

  1. II, III, IV, I
  2. I, II, III, IV
  3. I, III, II, IV
  4. ll, III, I, IV

Ans.     (4) ll, III, I, IV                                                                             [NCERT class 12, page 127]

 

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NEET Phase 2 2016 Solution Set XX

 

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Solution of NEET 2016 biology (1st phase) 01-05-2016

 

NEET Phase-I Biology solution

Code – X

(Downloadble pdf file is given below)

  1. The two polypeptides of human insulin are linked together by:
    1. Phosphodiester bond
    2. Covalentbond
    3. Disulphide bridges
    4. Hydrogen bonds

Ans.   (3) Disulphide bridges  [NCERT class 12, page 211]

  1. The coconut water from tender coconut represents :
    1. Fleshy mesocarp
    2. Free nuclear proembryo
    3. Free nuclear endosperm
    4. Endocarp

Ans.   (3) Free nuclear endosperm     [NCERT class 12, page 35]

  1. Which of the following is not a feature of the plasmids ?
    1. Circular structure
    2. Transferable
    3. Single – stranded
    4. Independent replication

Ans.   (3) Single – stranded     [NCERT class 12, page 194]

  1. Which is the National Aquatic Animal of India?
    1. River dolphin
    2. Blue whale
    3. Sea-horse
    4. Gangetic shark

Ans.   (1) River dolphin

  1. The Avena curvature is used for bioassay of:
    1. GA3
    2. IAA
    3. Ethylene
    4. ABA

Ans.   (2) IAA

  1. Which of the following is the most important cause of animals and plants being driven to extinction?
    1. Alien species invasion
    2. Habitat loss and fragmentation
    3. Co – extinctions
    4. Over – exploitation

Ans.   (2) Habitat loss and fragmentation      [NCERT class 12, page 264]

 

  1. Which of the following approaches does not give the defined action of contraceptive?
(1) Intra uterine devices increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperms
(2) Hormonal contraceptives Prevent/retard entry of sperms, prevent ovulation and fertilization
(3) Vasectomy prevents spermatogenesis
(4) Barrier methods prevent fertilization

Ans.   (3) Vasectomy – prevent spermatogenesis.     [NCERT class 12, page 59-62]

 

  1. In a testcross involving dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
    1. Chromosomes failed to separate during meiosis.
    2. The two genes are linked and present on the same chromosome.
    3. Both of the characters are controlled by more than one gene.
    4. The two genes are located on two different chromosomes.

Ans.    (2) The two genes are linked and present on the same chromosome.           [NCERT class 12, page 83]

 

  1. A typical fat molecule is made up of:
    1. One glycerol and three fatty acid molecules
    2. One glycerol and one fatty acid molecule
    3. Three glycerol and three fatty acid molecules
    4. Three glycerol molecules and one fatty acid molecule

Ans.    (1) One glycerol and three fatty acid molecules          [NCERT class 11, page 145, Fig.9.1]

 

  1. Match the terms in Column I with their description in Column II and choose the correct option:

Column I          Column II

(a)  Dominance        (i) Many genes govern a single character

(b)  Codominance   (ii) In a heterozygous organism only one allele expresses itself

(c)  Pleiotropy         (iii) In a heterozygous organism both alleles express themselves fully

(d) Polygenic           (iv) A single gene influences inheritancemany characters

Code:

(a)        (b)          (c)          (d)

  1. (ii)       (iii)       (iv)       (i)
  2. (iv)       (i)         (ii)        (iii)
  3. (iv)     (iii)         (i)         (ii)
  4. (ii)        (i)         (iv)       (iii)

Ans.    (1)         a-(ii)    b-(iii)     c-(iv)    d-(i)

  1. Which of the following statements is not correct?
    1. Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.
    2. Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
    3. Some reptiles have also been reported as pollinators in some plant species.
    4. Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.

Ans     (4) Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.          [NCERT class 12, page 30,31,32]

  1. Which of the following features is not present in Periplaneta americana?
    1. Indeterminate and radial cleavage during embryonic development
    2. Exoskeleton composed of N-acetylglucosamine
    3. Metamerically segmented body
    4. Schizocoelom as body cavity

Ans      (1) Indeterminate and radial cleavage during embryonic development.

58.Water soluble pigments found in plant cell vacuoles are:

  1. Chlorophylls
  2. Carotenoids
  3. Anthocyanins
  4. Xanthophylls

Ans    (3) Anthocyanins.

59.A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in:

  1. Polyploidy
  2. Somaclonal variation
  3. Polyteny
  4. Aneuploidy

Ans.      (1) Polyploidy

60.A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

  1. C4
  2. CAM
  3. Nitrogen fixer
  4. C3

Ans.     (1)     C4

61.In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to:

  1. Graft rejection
  2. Auto-immune disease
  3. Active immunity
  4. Allergic response

Ans.     (2) Auto-immune disease                             [NCERT class 12, page 153]

62.Emerson’s enhancement effect and Red drop have been instrumental in the discovery of:

  1. Two photosystems operating simultaneously
  2. Photophosphorylation and cyclic electron transport
  3. Oxidative phosphorylation
  4. Photophosphorylation and non-cyclic electron transport

Ans.     (1) Two photosystems operating simultaneously

63.Select the correct statement:

  1. Salvinia, Ginkgo and Pinus all are gymnosperms
  2. Sequoia is one of the tallest trees
  3. The leaves of gymnosperms are not well adapted to extremes of climate
  4. Gymnosperms are both homosporous and heterosporous

Ans.     (2) Sequoia is one of the tallest trees                    [NCERT class 11, page 39]

64. Which of the following is not a characteristic feature during mitosis in somatic cells?

  1. Disappearance of nucleolus
  2. Chromosome movement
  3. Synapsis
  4. Spindle fibres

Ans.      (3) Synapsis                                             [NCERT class 11, page 168]

65. Blood pressure in the pulmonary artery is:

  1. more than that in the carotid.
  2. more than that in the pulmonary vein.
  3. less than that in the venae cavae.
  4. same as that in the aorta.

Ans.     (2) more than that in the pulmonary vein.

 

66. Which of the following structures is homologus to the wing of a bird?

  1. Wing of a Moth
  2. Hind limb of Rabbit
  3. Flipper of Whale
  4. Dorsal fin of a Shark

Ans.     (3) Flipper of whale.

67. Seed formation without fertilization in flowering plants involves the process of:

  • Budding
  • Somatic hybridization
  • Apomixis
  • Sporulation

Ans.      (3) Apomixis                                            [NCERT class 12, page 38]

68. Name the chronic respiratory disorder caused mainly by cigarette smoking:

  • Asthma
  • Respiratory acidosis
  • Respiratory alkalosis
  • Emphysema

Ans.      (4) Emphysema                                       [NCERT class 11, page 275]

69. Spindle fibres attach on to:

  1. Kinetochore of the chromosome
  2. Centromere of the chromosome
  3. Kinetosome of the chromosome
  4. Telomere of the chromosome

Ans.     (1) Kinetochore of the chromosome                      [NCERT class 11, page 165]

70. In context of Amniocentesis, which of the following statement is incorrect?

  1. It is used for prenatal sex determination.
  2. It can be used for detection of Down syndrome.
  3. It can be used for detection of Cleft palate.
  4. It is usually done when a woman is between 14 -16 weeks pregnant.

Ans.   (3) It can be used for detection of Cleft palate.

71. Stems modified into flat green organs performing the functions of leaves are known as:

  1. phyllode
  2. Phylloclades
  3. Scales
  4. Cladodes

Ans.   (2) Phylloclade.

72. In a chloroplast the highest number of protons are found in:

  1. Lumen of thylakoids
  2. Inter membrane space
  3. Antennae complex
  4. Stroma

Ans.      (1) Lumen of thylakoids                         [NCERT class 11, page 213]

73. Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?

  1. The first word in a biological name represents the genus name, and the second is a specific epithet
  2. The names are written in Latin and are italicised
  3. When written by hand, the names are to be underlined
  4. Biological names can be written in any language

Ans.     (4) Biological names can be written in any language                [NCERT class 11, page 7]

74. In meiosis crossing over is initiated at:

  1. Leptotene
  2. Zygotene
  3. Diplotene
  4. Pachytene

Ans.     (4) Pachytene

75. Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain:

  1. Harvested antibodies
  2. Gamma globulin
  3. Attenuated pathogens
  4. Activated pathogens

Ans.      (3) Attenuated pathogens

76. The taq polymerase enzyme is obtained from:

  1. Thiobacillus ferroxidans
  2. Bacillus subtilis
  3. Pseudomonas putida
  4. Thermus aquaticus

Ans.      (4) Thermus aquaticus                   [NCERT class 12, page 203]

 

  1. Which of the following most appropriately describes haemophilia?
    1. X-linked recessive gene disorder
    2. Chromosomal disorder
    3. Dominant gene disorder
    4. Recessive gene disorder

Ans.      (1)     X-linked recessive gene disorder  [NCERT class 12, page 89]

 

  1. The standard petal of a papilionaceous corolla is also called:
    1. Pappus
    2. Vexillum
    3. Corona
    4. Carina

Ans.      (2)     vexillum                         [NCERT class 11, page 74]

  1. Which part of the tobacco plant is infected by Meloidogyne incognita ?
    1. Leaf
    2. Stem
    3. Root
    4. Flower

Ans.     (3) Root

  1. Which of the following statements is wrong foi viroids ?
    1. They are smaller than viruses
    2. They cause infections
    3. Their RNA is of high molecular weight
    4. They lack a protein coat

Ans.     (3)     Their RNA is of high molecular weight           [NCERT class 11, page 27]

81. Which of the following statements is not true for cancer cells in relation to mutations?

  1. Mutations destroy telomerase inhibitor.
  2. Mutations inactivate the cell control.
  3. Mutations inhibit production of telomerase.
  4. Mutations in proto-oncogenes accelerate the cell cycle.

Ans.    (3)     Mutations inhibit production of telomerase.

82. Which type of tissue correctly matches with its location?

Tissue                                        Location

  1. Areolar tissue                                 Tendons
  2. Transitional epithelium              Tip of nose
  3. Cuboidal epithelium                     Lining of stomach
  4. Smooth muscle                              Wall of intestine

Ans.      (4)     Smooth muscle                     Wall of intestine             [NCERT class 11, page 101,103,105]

83. Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

  1. Insulin –              Glucagon
  2. Aldosterone –              Atrial Natriuretic Factor
  3. Relaxin –               Inhibin
  4. Parathormone –              Calcitonin

Ans.      (3)     Relaxin                        –               Inhibin

84. Specialised epidermal cells surrounding the guard cells are called:

  1. Subsidiary cells
  2. Bulliformcells
  3. Lenticels
  4. Complementary cells

Ans.     (1)    Subsidiary cells                         [NCERT class 11, page 89]

85. Fertilization in humans is practically feasible only if:

  1. the ovum and sperms are transported simultaneously to ampullary – isthmic junction of the fallopian tube.
  2. the ovum and sperms are transported simultaneously to ampullary – isthmic junction of the cervix.
  3. the sperms are transported into cervix within 48 hrs of release of ovum in uterus.
  4. the sperms are transported into vagina just after the release of ovum in fallopian tube.

Ans.     (1)     the ovum and sperms are transported simultaneously to ampullary – isthmic junction of the fallopian tube.                                   [NCERT class 12, page 51]

86. Which one of the following is the starter codon?

  1. UGA
  2. UAA
  3. UAG
  4. AUG

Ans.      (4)     AUG                 [NCERT class 12, page 112]

87. A river with an inflow of domestic sewage rich in organic waste may result in:

  1. Increased population of aquatic food web organisms.
  2. An increased production of fish due to biodegradable nutrients.
  3. Death of fish due to lack of oxygen.
  4. Drying of the river very soon due to algal bloom.

Ans.     (3)     Death of fish due to lack of oxygen.                            [NCERT class 12, page 275]

88. Following are the two statements regarding the origin of life:

(a)  The earliest organisms that appeared on the earth were non-green and presumably anaerobes.

(b) autotrophic organisms were the chemoautotrophs that never released oxygen.

Of the above statements which one of the following options is correct ?

  1. (b) is correct but (a) is false.
  2. Both (a) and (b) are correct.
  3. Both (a) and (b) are false.
  4. (a) is correct but (b) is false.

Ans.     (2)     Both (a) and (b) are correct.

  1. A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called:
    1. Contour fanning
    2. Strip farming
    3. Shifting agriculture
    4. Ley farming

Ans.     (4)     Ley farming

 

  1. Gause’s principle of competitive exclusion states that:
    1. Competition for the same resources excludes species having different food preferences
    2. No two species can occupy the same niche indefinitely for the same limiting resources.
    3. Larger organisms exclude smaller ones through competition.
    4. More abundant species will exclude the less abundant species through competition.

Ans.     (2)     No two species can occupy the same niche indefinitely for the same limiting resources. [NCERT class 12, page 235]

  1. Which of the following characteristic features always holds true for the corresponding group of animals?
(1) Viviparous Mammalia
(2) Possess a mouth with an upper and a lower jaw Chordata
(3) 3 – chambered heart with one incompletely divided ventricle Reptilia
(4) Cartilaginous endoskeleton Chondrichthyes

Ans.    (4)     Cartilaginous endoskeleton – Chondrichthyes

  1. Changes in GnRH pulse frequency in females is controlled by circulating levels of:
    1. estrogen and inhibin
    2. progesterone only
    3. progesterone and inhibin
    4. estrogen and progesterone

Ans.   (4)   estrogen and progesterone

  1. Microtubules are the constituents of:
    1. Spindle fibres, Centrioles and Cilia
    2. Centrioles, Spindle fibres and Chromatin
    3. Centrosome, Nucleosome and Centrioles
    4. Cilia, Flagella and Peroxisomes

Ans.     (1)     Spindle fibres, Centrioles and Cilia               [NCERT class 11, page 137,164]

 

  1. Mitochondria and chloroplast are:

(a) semi-autonomous organelles.

(b) formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery.

             Which one of the following options is correct ?

  1. (b) is true but (a) is false.
  2. (a) is true but (b) is false.
  3. Both (a) and (b) are false.
  4. Both (a) and (b) are correct.

Ans.     (2)     (a) is true but (b) is false.

 

  1. Photosensitive compound in human eye is made up of:
    1. Opsin and Retinal
    2. Opsin and Retinol
    3. Transducin and Retinene
    4. Guanosine and Retinol

Ans.     (1)     Opsin and Retinal                  [NCERT class 11, page 324]

96. Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the kingdom:

  1. Protista
  2. Fungi
  3. Animalia
  4. Monera

Ans.     (1)     Protista                                       [NCERT class 11, page 20]

97. The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the:

  1. Thermoacidophiles
  2. Methanogens
  3. Eubacteria
  4. Halophiles

Ans.     (2)     Methanogens                          [NCERT class 11, page 19]

98. Identify the correct statement on ‘inhibin’:

  1. Is produced by granulose cells in ovary and inhibits the secretion of FSH.
  2. Is produced by granulose cells in ovary and inhibits the secretion of LH.
  3. Is produced by nurse cells in testes and inhibits the secretion of LH.
  4. Inhibits the secretion of LH, FSH and Prolactin.

Ans.     (1)     Is produced by granulose cells in ovary and inhibits the secretion of FSH.

99. It is much easier for a small animal to run uphill than for a large animal, because:

  1. Smaller animals have a higher metabolic rate.
  2. Small animals have a lower O2
  3. The efficiency of muscles in large animals is less than in the small animals.
  4. It is easier to carry a small body weight.

Ans.     (1)     Smaller animals have a higher metabolic rate.

100. A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of:

  1. 1:2:1:: Tall heterozygous: Tall homozygous : Dwarf
  2. 3:1:: Tall: Dwarf
  3. 3:1:: Dwarf: Tall
  4. 1:2:1:: Tall homozygous: Tall heterozygous : Dwarf

Ans.     (4)     1:2:1:: Tall homozygous: Tall heterozygous : Dwarf           [NCERT class 12, page 74]

101.Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers:

  1. Ozone
  2. Ammonia
  3. Methane
  4. Nitrous oxide

Ans.     (1)     Ozone                                           [NCERT class 12, page 283]

102.Which one of the following is a characteristic feature of cropland ecosystem?

  1. Least genetic diversity
  2. Absence of weeds
  3. Ecological succession
  4. Absence of soil organisms

Ans.     (1)     Least genetic diversity

103.Tricarpellary, syncarpous gynoecium is found in flowers of:

  1. Solanaceae
  2. Fabaceae
  3. Poaceae
  4. Liliaceae

Ans.     (4)     Liliaceae                        [NCERT class 11, page 81]

104.In which of the following, all three are macronutrients?

  1. Iron, copper, molybdenum
  2. Molybdenum, magnesium, manganese
  3. Nitrogen, nickel, phosphorus
  4. Boron, zinc, manganese

Ans.     (Bonus)                                    [NCERT class 11, page 196]

105. Reduction in pH of blood will:

  1. reduce the blood supply to the brain.
  2. decrease the affinity of hemoglobin with oxygen.
  3. release bicarbonate ions by the liver.
  4. reduce the rate of heart beat.

Ans.     (2)     decrease the affinity of hemoglobin with oxygen    [NCERT class 11, page 274]

106. Lack of relaxation between successive stimuli in sustained muscle contraction is known as:

  1. Fatigue
  2. Tetanus
  3. Tonus
  4. Spasm

Ans.     (2)     Tetanus

107. Which one of the following statements is wrong?

  1. Golden algae are also called desmids.
  2. Eubacteria are also called false bacteria.
  3. Phycomycetes are also called algal fungi.
  4. Cyanobacteria are also called blue-green algae.

Ans.     (2)     Eubacteria are also called false bacteria.                   [NCERT class 11, page 19, 20]

108. Which of the following is a restriction endonuclease?

  1. Protease
  2. DNase I
  3. RNase
  4. Hind II

Ans.     (4)     Hind II                                             [NCERT class 12, page 195]

  1. Which of the following would appear as the pioneer organisms on bare rocks?
  1. Liverworts
  2. Mosses
  3. Green algae
  4. Lichens

Ans.     (4)     Lichens                                          [NCERT class 12, page 251]

  1. Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options:
    1. Both processes can happen together because the diffusion coefficient of water and CO2 is different.
    2. The above processes happen only during night time.
    3. One process occurs during day time, and the other at night.
    4. Both processes cannot happen simultaneously.

Ans.     (1)     Both processes can happen together because the diffusion coefficient of water and CO2 is different.

  1. Cotyledon of maize grain is called:
    1. coleorhiza
    2. coleoptile
    3. scutellum
    4. plumule

Ans.     (3) Scutellum                                           [NCERT class 11, page 77]

  1. Which of the following guards the opening of hepatopancreatic duct into the duodenum?
    1. Ileocaecal valve
    2. Pyloric sphincter
    3. Sphincter of Oddi
    4. Semilunar valve

Ans.     (3) Sphincter of Oddi                                             [NCERT class 11, page 261]

  1. In the stomach, gastric acid is secreted by the:
    1. parietal cells
    2. peptic cells
    3. acidic cells
    4. gastrin secreting cells

Ans.     (1) parietal cells                 [NCERT class 11, page 262]

  1. In mammals, which blood vessel would normally carry largest amount of urea?
    1. Dorsal Aorta
    2. Hepatic Vein
    3. Hepatic Portal Vein
    4. Renal Vein

Ans.    (2)   Hepatic vein

115. The term ecosystem was coined by:

  1. A. G. Tansley
  2. Haeckel
  3. Warming
  4. P. Odum

Ans.     (1) A.G. Tansley

116. Which of the following is required as inducer(s) for the expression of Lac operon?

  1. galactose
  2. lactose
  3. lactose and galactose
  4. glucose

Ans.     (2) lactose                                                [NCERT class 12, page 117]

117. Which of the following is wrongly matched in the given table?

  Microbe Product Application
(1) Monascus purpureus Statins lowering of blood cholesterol
(2) Streptococcus Streptokinase removal of clot from blood vessel
(3) Clostridium butylicum Lipase removal of oil stains
(4) Trichoderma polysporum Cyclosporin A immunosuppressive drug

Ans.   (3)   Clostridium butylicum – Lipase – removal of oil stains             [NCERT class 12, page 183]

118. When does the growth rate of a population following the logistic model equal zero ? The logistic model is given as dN/dt = rN(l-N/K):

  1. when N nears the carrying capacity of the habitat.
  2. when N/ K equals zero.
  3. when death rate is greater than birth rate.
  4. when N/K is exactly one.

Ans.   (4)   when N/K is exactly one.                                             [NCERT class 12, page 231]

119. Which one of the following statements is not true ?

  1. Exine of pollen grains is made up of sporopollenin
  2. Pollen grains of many species cause severe allergies
  3. Stored pollen in liquid nitrogen can be used in the crop breeding programmes
  4. Tapetum helps in the dehiscence of anther.

Ans.   (4)   Tapetum helps in the dehiscence of anther.             [NCERT class 12, page 21-23]

120. In bryophytes and pteridophytes, transport of male gametes requires:

  1. Insects
  2. Birds
  3. Water
  4. Wind

Ans.   (3)   Water                                             [NCERT class 11, page 35-36]

121. Which of the following is not a stem modification ?

  1. Thorns of citrus
  2. Tendrils of cucumber
  3. Flattened structures of Opuntia
  4. Pitcher of Nepenthes

Ans.   (4)   Pitcher of Nepenthes                                   [NCERT class 11, page 68,69,71]

122. Which one of the following cell organelles is enclosed by a single membrane ?

  1. Chloroplasts
  2. Lysosomes
  3. Nuclei
  4. Mitochondria

Ans.   (2)   Lysosomes                     [NCERT class 11, page 134,136,140]

123. Analogous structures are a result of:

  1. Convergent evolution
  2. Shared ancestry
  3. Stabilizing selection
  4. Divergent evolution

Ans.   (1)   Convergent evolution                  [NCERT class 12, page 131]

124. Which one of the following statements is wrong ?

  1. Cellulose is a polysaccharide.
  2. Uracil is a pyrimidine.
  3. Glycine is a sulphur containing amino acid.
  4. Sucrose is a disaccharide.

Ans.   (3)   Glycine is a sulphur containing amino acid.              [NCERT class 11, page 197]

125. Proximal end of the filament of stamen is attached to the:

  1. Connective
  2. Placenta
  3. Thalamus or petal
  4. Anther

Ans.   (3)   Thalamus or petal

 

  1. Which of the following is not required for any of the techniques of DNA fingerprinting available at present?
    1. Zinc finger analysis
    2. Restriction enzymes
    3. DNA-DNA hybridization
    4. Polymerase chain reaction

Ans.     (1)     Zinc finger analysis                       [NCERT class 12, page 121-122]

 

  1. Which one of the following characteristics is not shared by birds and mammals?
    1. Breathing using lungs
    2. Viviparity
    3. Warm blooded nature
    4. Ossified endoskeleton

Ans.    (2)   Viviparity                                                       [NCERT class 11, page 59-60]

 

  1. Select the incorrect statement:
    1. LH triggers ovulation in ovary.
    2. LH and FSH decrease gradually during the follicular phase.
    3. LH triggers secretion of androgens from the Leydig cells.
    4. FSH stimulates theSertoli cells which help in spermiogenesis.

Ans.    (2)   LH and FSH decrease gradually during the follicular phase.

[NCERT class 11, page 332]

 

  1. The amino acid Tryptophan is the precursor for the synthesis of:
    1. Thyroxine and Triiodothyronine
    2. Estrogen and Progesterone
    3. Cortisol and Cortisone
    4. Melatonin and Serotonin

Ans.    (4)   Melatonin and Serotonin

 

  1. Joint Forest Management Concept was introduced in India during:
    1. 1970s
    2. 1980s
    3. 1990s
    4. 1960s

Ans.    (2)   1980s                                                                                 [NCERT class 12, page 258]

 

  1. One of the major components of cell wall of most fungi is:
    1. Peptidoglycan
    2. Cellulose
    3. Hemicellulose
    4. Chitin

Ans.    (4)   chitin                                                                     [NCERT class 11, page 22]

 

  1. A complex of ribosomes attached to a single strand of RNA is known as:
    1. Polymer
    2. Polypeptide
    3. Okazaki fragment
    4. Polysome

Ans.    (4)   polysome                                       [NCERT class 11, page 129]

 

  1. Which of the following features is not present in the Phylum – Arthropoda?
    1. Metameric segmentation
    2. Parapodia
    3. Jointed appendages
    4. Chitinous exoskeleton

Ans.      (2)     Parapodia                                                                      [NCERT class 11, page 52-53]

 

  1. Asthma may be attributed to:
    1. allergic reaction of the mast cells in the lungs
    2. inflammation of the trachea
    3. accumulation of fluid in the lungs
    4. bacterial infection of the lungs

Ans.      (1)     allergic reaction of the mast cells in the lungs                          [NCERT class 12, page 153]

 

  1. Pick out the correct statements:

(a) Haemophilia is a sex-linked recessive disease.

(b) Down’s syndrome is due to aneuploidy.

(c) Phenylketonuria is an autosomal recessive gene disorder.

(d) Sickle cell anaemia is an X – linked recessive gene disorder.

  1. (b) and (d) are correct.
  2. (a), (c) and (d) are correct.
  3. (a), (b) and (c) are correct.
  4. (a) and (d) are correct.

Ans.      (3)     (a), (b) and (c) are correct.                                          [NCERT class 12, page 89-90]

 

 

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