NEET Phase-II Biology solution
Code – XX
Date – 24-07-2016
- A foreign DNA and plasmid cut by the samerestriction endonuclease can be joined toform a recombinant plasmid using
- ligase
- Eco RI
- Taq polymerase
- polymerase III
Ans. (1) Ligase [NCERT class 12, page 197]
- Which of the following is not a component ofdownstream processing?
- Expression
- Separation
- Purification
- Preservation
Ans. (1) Expression [NCERT class 12, page 205]
- Which of the following restriction enzymesproduces blunt ends?
- Hind III
- Sal I
- Eco RV
- Xho I
Ans. (3) Eco RV
- Which kind of therapy was given in 1990 to afour-year-old girl with adenosine deaminase(ADA) deficiency?
- Radiation therapy
- Gene therapy
- Chemotherapy
- Immunotherapy
Ans. (2) Gene therapy [NCERT class 12, page 211]
- How many hot spots of biodiversity in theworld have been identified till date byNorman Myers?
- 43
- 17
- 25
- 34
Ans. (4) 34 [NCERT class 12, page 266]
- The primary producers of the deep-seahydrothermal vent ecosystem are
- coral reefs
- green algae
- chemosynthetic bacteria
- blue-green algae
Ans. (3) chemosynthetic bacteria [NCERT class 12, page 226]
- Which of the following is correct forr-selected species?
- Small number of progeny with large size
- Large number of progeny with small size
- Large number of progeny with large size
- Small number of progeny with small size
Ans. (2) Large number of progeny with small size
- If’+’ sign is assigned to beneficial interaction, ‘-’ sign to detrimental and ‘0’ sign to neutralinteraction, then the population interactionrepresented by ‘+’ refers to
- parasitism
- mutualism
- amensalism
- commensalism
Ans. (1) parasitism [NCERT class 12, page 232]
- Which of the following is correctly matched?
- Stratification—Population
- Aerenchyma—Opuntia
- Age pyramid—Biome
- Parthenium hysterophorus—Threat to biodiversity
Ans. (4) Parthenium hysterophorus—Threat to biodiversity [NCERT class 12, page 265]
- Red List contains data or information on
- marine vertebrates only
- all economically important plant
- plants whose products are ininternational trade
- threatened species
Ans. (4) threatened species [NCERT class 12, page 263]
- Which one of the following is wrongfor fungi?
- They are both unicellular and
- They are eukaryotic.
- All fungi possess a purely cellulosic cell wall.
- They are heterotrophic
Ans. (3) All fungi possess a purely cellulosic cell wall [NCERT class 11, page 22]
- Methanogens belong to
- Slime moulds
- Eubacteria
- Archaebacteria
- Dinoflagellates
Ans. (3) Archaebacteria [NCERT class 11, page 19]
- Select thewrong
- Diatoms are microscopic and floatpassively in water.
- The walls of diatoms are easily
- ‘Diatomaceous earth’ is formed by thecell walls of diatoms.
- Diatoms are chief producers in the
Ans. (2) The walls of diatoms are easily destructible. [NCERT class 11, page 20]
- The label of a herbarium sheetdoes not carry information on
- height of the plant
- date of collections
- name of collector
- local names
Ans. (1) height of the plant [NCERT class 11, page 12]
- Conifers are adapted to tolerate extremeenvironmental conditions because of
- presence of vessels
- broad hardy leaves
- superficial stomata
- thick cuticle
Ans. (4) thick cuticle [NCERT class 11, page 38]
- which one of the following statements iswrong?
- Laminaria and Sargassum are used as
- Algae increase the level of dissolved oxygen in the immediate environment.
- Algin is obtained from red algae, andcarrageenan from brown algae.
- 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]
- The term ‘polyadelphous’ is related to
- calyx
- gynoecium
- androecium
- corolla
Ans. (3) androecium [NCERT class 11, page 75]
- How many plants among, indigophera, Sesbania, Salvia, Allium, Aloe, Mustard, Groundnut, Radish, Gram, and Turnip have stamens with different lengths in their flowers?
- six
- Three
- Four
- Five
Ans. (3) Four (Salvia, Mustard, Radish, Turnip) [NCERT class 11, page 75]
- Radial symmetry is found in the flowers of
- Cassia
- Brassica
- Trifolium
- Pisum
Ans. (2) Brassica [NCERT class 11, page 72,79]
- Free-central placentation is found in
- Citrus
- Dianthus
- Argemone
- Brassica
Ans. (2) Dianthus [NCERT class 11, page 75]
- Cortex is the region found between
- endodermis and vascular bundle
- epidermis and stele
- pericycle and endodermis
- endodermis and pith
Ans. (2) epidermis and stele [NCERT class 11, page 91]
- The balloon-shaped structures called tyloses
- are linked to the ascent of sap through xylem vessels
- originate in the lumen of vessels
- Characterize the sapwood
- are extensions of xylem parenchyma cells into vessels
Ans. (4) are extensions of xylem parenchyma cells into vessels
- A non-proteinaceous enzyme is
- deoxyribonuclease
- lysozyme
- ribozyme
- ligase
Ans. (3) ribozyme [NCERT class 11, page 154]
- Select the
- Methanogens—Prokaryote
- Gas vacuoles—Green bacteria
- Large central vacuoles—Animal cells
- Protists—Eukaryotes
Ans. (3) Large central vacuoles—Animal cells [NCERT class 11, page 129]
- Select the wrong
- Mycoplasma is a wall-less
- Bacterial cell wall is made up of
- Pili and fimbriae are mainly involved inmotility of bacterial cells.
- Cyanobacteria lack flagellated cells.
Ans. (3) Pili and fimbriae are mainly involved in motility of bacterial cells [NCERT class 11, page 129]
- A cell organelle containing hydrolyticenzymes is
- mesosome
- lysosome
- microsome
- ribosome
Ans. (2) lysosomes [NCERT class 11, page 134]
- During cell growth, DNA synthesis takesplace in
- M phase
- S phase
- G1 phase
- G2 phase
Ans. (2) S phase [NCERT class 11, page 163]
- Which of the following biomolecules iscommon to respiration-mediated breakdownof fats, carbohydrates and proteins?
- Acetyl CoA
- Glucose-6-phosphate
- Fructose 1,6-bisphosphate
- Pyruvic acid
Ans. (1) Acetyl CoA [NCERT class 11, page 236]
- 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?
- Absence of sugar
- Acidic
- Alkaline
- Low refractive index
Ans. (3) Alkaline
- 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?
- Gibberellin and abscisic acid
- IAA and gibberellins
- Auxin and cytokinin
- Auxin and abscisic acid
Ans. (3) Auxin and cytokinin [NCERT class 12, page 177]
- Phytochrome is a
- Chromoprotein
- Flavoprotein
- Glycoprotein
- Lipoprotein
Ans. (1) Chromoprotein
- Which is essential for the growth of root tip?
- Mn
- Zn
- Fe
- Ca
Ans. (2) Zn [NCERT class 11, page 198,248]
- The process which makes major differencebetween C3 and C4 plants is
- respiration
- glycolysis
- Calvin cycle
- Photorespiration
Ans. (4) Photorespiration [NCERT class 11, page 220]
- Which one of the following statements is not correct?
- Water hyacinth, growing in the standingwater, drains oxygen from water thatleads to the death of fishes.
- Offspring produced by the asexualreproduction are called clone.
- Microscopic, motile asexual reproductivestructures are called zoospores.
- 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]
- Which one of the following generates newgenetic combinations leading to variation?
- Nucellar polyembryony
- Vegetative reproduction
- Parthenogenesis
- Sexual reproduction
Ans. (4) Sexual reproduction [NCERT class 12, page 38]
- 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
- (iii) (i) (iv) (ii)
- (iv) (iii) (i) (ii)
- (ii) (i) (iv) (iii)
- (i) (ii) (iv) (iii)
Ans. (1) a-(iii), b-(i), c-(iv), d-(ii) [NCERT class 11, page 23,75]
- In majority of angiosperms
- a small central cell is present in theembryo sac
- egg has a filiform apparatus
- there are numerous antipodal cells
- reduction division occurs in themegaspore mother cells
Ans. (4) reduction division occurs in the megaspore mother cells [NCERT class 12, page 26,27]
- Pollination in water hyacinth and water lily isbrought about by the agency of
- Bats
- Water
- insects or wind
- birds
Ans. (3) insects or wind [NCERT class 12, page 29]
- The ovule of an angiosperm is technicallyequivalent to
- megaspore
- megasporangium
- megasporophyll
- megaspore mother cell
Ans. (2) megasporangium [NCERT class 12, page 25]
- Taylor conducted the experiments to provesemiconservative mode of chromosomereplication on
- coli
- Vinca rosea
- Vicia faba
- Drosophila melanogaster
Ans. (3) Vicia faba [NCERT class 12, page 106]
- The mechanism that causes a gene to movefrom one linkage group to another is called
- crossing-over
- inversion
- duplication
- translocation
Ans. (4) translocation
- The equivalent of a structural gene is
- recon
- muton
- cistron
- operon
Ans. (3) Cistron [NCERT class 12, page 109]
- A true breeding plant is
- always homozygous recessive in itsgenetic constitution
- one that is able to breed on its own
- produced due to cross-pollination amongunrelated plant
- near homozygous and produces offspringof its own kind
Ans. (4) near homozygous and produces offspring of its own kind [NCERT class 12, page 70]
- Which of the following rRNAs acts asstructural RNA as well as ribozyme inbacteria?
- 8 S rRNA
- 5 S rRNA
- 18 S rRNA
- 23 S rRNA
Ans. (4) 23 S rRNA [NCERT class 12, page 115]
- Stirred-tank bioreactors have been designedfor
- ensuring anaerobic conditions in theculture vessel
- purification of product
- addition of preservatives to the product
- availability of oxygen throughout theprocess
Ans. (4) availability of oxygen throughout the process [NCERT class 12, page 204]
- A molecule that can act as a genetic materialmust fulfill the traits given below, except
- it should provide the scope for slow changes that are required for evolution
- it should be able to express itself in theform of ‘Mendelian characters’
- it should be able to generate its replica
- it should be unstable structurally andchemically
Ans. (4) it should be unstable structurally and chemically [NCERT class 12, page 103]
- DNA-dependent RNA polymerase catalyzestranscription on one strand of the DNAwhich is called the
- antistrand
- template strand
- coding strand
- alpha strand
Ans. (2) template strand [NCERT class 12, page 108]
- Interspecific hybridization is the mating of
- more closely related individuals withinsame breed for 4-6 generations
- animals within same breed withouthaving common ancestors
- two different related species
- superior males and females of differentbreeds
Ans. (3) two different related species [NCERT class 12, page 168]
- which of the following is correctregardingAIDS causative agent HIV?
- HIV does not escape but attacks theacquired immune response.
- HIV is enveloped virus containing onemolecule of single-stranded RNA and onemolecule of reverse transcriptase.
- HIV is enveloped virus that contains twoidentical molecules of single-stranded RNA and two molecules of reverse
- 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
- Among the following edible fishes, whichone is a marine fish having rich source ofomega-3 fatty acids?
- Mackerel
- Mystus
- Mangur
- Mrigala
Ans. (1) Mackerel [NCERT class 12, page 169]
- Match Column—I with Column—II and select the correct option using the codesgiven below:
Column—I Column—II
- Citric acid (i) Trichoderma
- Cyclosporin A (ii) Clostridium
- Statins (iii) Aspergillus
- Butyric acid (iv) Monascus
Codes :
a b c d
- (iii) (iv) (i) (ii)
- (iii) (i) (ii) (iv)
- (iii) (i) (iv) (ii)
- (i) (iv) (ii) (iii)
Ans. (3) a-(iii), b-(i), c-(iv), d-(ii) [NCERT class 12, page 183]
- Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodiesreceiving effluents from.
- sugar industry
- domestic sewage
- dairy industry
- petroleum industry
Ans. (4) petroleum industry [NCERT class 12, page 276]
- The principle of competitive exclusion wasstated by
- Verhulst and Pearl
- Darwin
- F. Gause
- MacArthur
Ans. (3) G. F. Gause [NCERT class 12, page 234]
- Which of the following National Parks is home to the famous musk deer or hangul?
- Dachigam National Park, Jammu &Kashmir
- Keibul Lamjao National Park, Manipur
- Bandhavgarh National Park, MadhyaPradesh
- Eaglenest Wildlife Sanctuary, ArunachalPradesh
Ans. (1) Dachigam National Park, Jammu & Kashmir
- A lake which is rich in organic waste mayresult in
- mortality of fish due to lack of oxygen
- increased population of aquaticorganisms due to minerals
- drying of the lake due to algal bloon
- increased population of fish due to lots ofnutrients
Ans. (1) mortality of fish due to lack of oxygen [NCERT class 12, page 275]
- The highest DDT concentration in aquaticfood chain shall occur in
- eel
- phytoplankton
- seagull
- crab
Ans. (3) seagull [NCERT class 12, page 276]
- Which-of the following sets of diseases iscaused by bacteria?
- Herpes and influenza
- Cholera and tetanus
- Typhoid and smallpox
- Tetanus and mumps
Ans. (2) Cholera and tetanus [NCERT class 11, page 26]
- Match Column—I with Column—II forhousefly classification and select the correctoption using the codes given below :
Column—I Column—II
- Family (i) Diptera
- order (ii) Arthropoda
- Class (iii) Muscidae
- Phylum (iv) Insecta
Codes :
a b c d
- (iv) (ii) (i) (iii)
- (iii) (i) (iv) (ii)
- (iii) (ii) (iv) (i)
- (iv) (iii) (ii) (i)
Ans. (2) a-(iii), b-(i), c-(iv), d-(ii). [NCERT class 11, page 11]
- Choose the correct
- All Pisces have gills covered by an
- All mammals are viviparous.
- All cyclostomes do not possess jaws and paired fins.
- All reptiles have a three-chambered
Ans. (3) All cyclostomes do not possess jaws and paired fins [NCERT class 11, page 56-59]
- Study the four statements (A-D) given belowand select the two correct ones out of them:
- Definition of biological species was givenby Ernst Mayr.
- Photoperiod does not affect reproductionin plants.
- Binomial nomenclature system wasgiven by R. H.
- 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]
- In male cockroaches, sperms are stored in which part of the reproductive system?
- Vas deferens
- Seminal vesicles
- Mushroom glands
- Testes
Ans. (2) Seminal vesicles [NCERT class 11, page 114]
- Smooth muscles are
- voluntary, spindle-shaped, uninucleate
- involuntary, fusiform, non-striated
- voluntry, multinucleate, cylindrical
- involuntary, cylindrical, striated
Ans. (2) involuntary, fusiform, non-striated [NCERT class 11, page 105,303]
- Oxidative phosphorylation is
- formation of ATP by energy released from electrons removed during substrateoxidation
- formation of ATP by transfer ofphosphate group from a substrateto ADP
- oxidation of phosphate group in ATP
- 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]
- Which of the following is the least likely to beinvolved in stabilizing the three-dimensionalfolding of most proteins?
- Ester bonds
- Hydrogen bonds
- Electrostatic interaction
- Hydrophobic interaction
Ans. (1) Ester bonds [NCERT class 11, page 150]
- Which of the following describes the given graph correctly?
- Exothermic reaction with energy A inabsence of enzyme and B in presence ofenzyme
- Endothermic reaction with energy A inpresence of enzyme and B in absence ofenzyme
- Exothermic reaction with energy A inpresence of enzyme and B in absence ofenzyme
- 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]
- When cell has stalled DNA replication fork,which checkpoint should be predominantlyactivated?
- Both G2/M and M
- G1/S
- G2/M
- M
Ans. (2) G1/S [NCERT class 11, page 164]
- 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
- (iv) (iii) (ii) (i)
- (iii) (iv) (ii) (i)
- (i) (iv) (ii) (iii)
- (ii) (iv) (iii) (i)
Ans. (2) a-(iii), b-(iv), c-(ii), d-(i) [NCERT class 11, page 168]
- Which hormones do stimulate theproduction of pancreatic juice andbicarbonate?
- Insulin and glucagon
- Angiotensin and epinephrine
- Gastrin and insulin
- Cholecystokinin and secretin
Ans. (4) Cholecystokinin and secretin [NCERT class 11, page 338]
- The partial pressure of oxygen in the alveoliof the lungs is
- less than that of carbon dioxide
- equal to that in the blood
- more than that in the blood
- less than that in the blood
Ans. (3) more than that in the blood [NCERT class 11, page 272]
- Choose the correct
- Receptors do not produce graded
- Nociceptors respond to changes in
- Meissner’s corpuscles are thermoreceptors.
- 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.
- Graves’ disease is caused due to
- hypersecretion of adrenal gland
- hyposecretion of thyroid gland
- hypersecretion of thyroid gland
- hyposecretion of adrenal gland
Ans. (3) hypersecretion of thyroid gland
- Name the ion responsible for unmasking ofactive sites for myosin for cross-bridgeactivity during muscle contraction.
- Potassium
- Calcium
- Magnesium
- Sodium
Ans. (2) Calcium [NCERT class 11, page 307]
- Name the blood cells, whose reduction innumber can cause clotting disorder, leadingto excessive loss of blood from the
- Thrombocytes
- Erythrocytes
- Leucocytes
- Neutrophils
Ans. (1) Thrombocyte [NCERT class 11, page 280]
- Name a peptide hormone which acts mainlyon hepatocytes, adipocytes and enhancescellular glucose uptake and utilization.
- Gastrin
- Insulin
- Glucagon
- Secretin
Ans. (2) Insulin [NCERT class 11, page 336]
- Osteoporosis, an age-related disease ofskeletal system, may occur due to
- accumulation of uric acid leading toinflammation of joints
- immune disorder affecting neuromuscular junction leading to fatigue
- high concentration of Ca++ and Na+
- decreased level of estrogen
Ans. (4) decreased level of estrogen [NCERT class 11, page 312]
- Serum differs from blood in.
- lacking antibodies
- lacking globulins
- lacking albumins
- lacking clotting factors
Ans. (4) lacking clotting factors [NCERT class 11, page 279]
- Lungs do not collapse between breaths andsome air always remains in the lungs whichcan never be expelled because
- pressure in the lungs is higher than theatmospheric pressure.
- there is a negative pressure in the lungs
- there is a negative intrapleural pressure pulling at the lung walls
- there is a positive intrapleural pressure
Ans. (3) there is a negative intrapleural pressure pulling at the lung walls
- The posterior pituitary gland is nota trueendocrine gland because
- it secretes enzymes
- it is provided with a duct
- only stores and releases hormones
- it is under the regulation of hypothalamus
Ans. (3) only stores and releases hormones [NCERT class 11, page 332]
- The part of nephron involved in activereabsorption of sodium is
- descending limb of Henle’s loop
- distal convoluted tubule
- proximal convoluted tubule
- Bowman’s capsule
Ans. (3) proximal convoluted tubule [NCERT class 11, page 294]
- Which of the following is hormone-releasing IUD?
- Cu7
- LNG-20
- Multiload 375
- Lippes loop
Ans. (2) LNG-20 [NCERT class 12, page 60]
- Which of the following is incorrectregarding vasectomy?
- Irreversible sterility
- No sperm occurs in seminal fluid
- No sperm occurs in epididymis
- Vasa deferentia is cut and tied.
Ans. (3) No sperm occurs in epididymis [NCERT class 12, page 62]
- Embryo with more than 16 blastomeresformed due to in vitro fertilization istransferred into
- cervix
- uterus
- fallopian tube
- fimbriae
Ans. (2) Uterus [NCERT class 12, page 64]
- Which of the following depicts the correct pathway of transport of sperms?
- Efferent ductules →Rete testis → Vasdeferens → Epididymis
- Rete testis →Efferent ductules→ Epididymis → Vas deferens
- Rete testis → Epididymis → Efferentductules → Vas deferens
- Rete testis → Vas deferens → Efferentductules → Epididymis
Ans. (2) Rete testis → Efferent ductules → Epididymis → Vas deferens [NCERT class 12, page 43]
- Match Column—I with Column—II andselect the correct option using the codesgiven below :
Column—I Column—II
- Mons pubis (i) Embryo formation
- Antrum (ii) Sperm
- Trophectoderm (iii) Female external genitalia
- Nebenkern (iv) Graafian follicle
Codes :
a b c d
- (i) (iv) (iii) (ii)
- (iii) (iv) (ii) (i)
- (iii) (iv) (i) (ii)
- (iii) (i) (iv) (ii)
Ans. (3) a-(iii), b-(iv), c-(i), d-(ii) [NCERT class 12, page 46,48]
- Several hormones like hCG, hPL, estrogenprogesterone are produced by
- pituitary
- ovary
- placenta
- fallopian tube
Ans. (3) placenta [NCERT class 12, page 53]
- 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
- Genetic drift operates in
- slow reproductive population
- small isolated population
- large isolated population
- non-reproductive population
Ans. (2) small isolated population [NCERT class 12, page 137]
- 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]
- The chronological order of human evolution/ from early to the recent is
- Australopithecus → Homo habilis → Ramapithecus → Homo erectus
- Australopithecus → Ramapithecus → Homo habilis → Homo erectus
- Ramapithecus → Australopithecus → Homo habilis → Homo erectus
- Ramapithecus → Homo habilis → Australopithecus → Homo erectus
Ans. (3) Ramapithecus → Australopithecus → Homo habilis → Homo erectus [NCERT class 12, page 140]
- 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
- II, III, IV, I
- I, II, III, IV
- I, III, II, IV
- 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