NEET 2020 · Biology

NEET 2020 Biology Questions with Solutions

The NEET 2020 paper had 90 Biology questions from 26 chapters. By section: 46 Botany and 44 Zoology.

Structural Organisation in Animals had the most questions (8), followed by Photosynthesis in Higher Plants and The Living World with 7 each.

16 questions below have the answer and explanation free; the other 74 are in Premium.

Practise NEET 2020 Biology free

Biology questions: 90
Chapters covered: 26
Solved free here: 16 of 90
Easy / Medium / Hard: 48 / 42 / 0

Difficulty is NEET MIND's own tag for each question.

Chapter-wise: NEET 2020 Biology

How many questions each chapter had in NEET 2020. Open a chapter for its questions from every year.

All 90 NEET 2020 Biology questions

In paper order. Try each one, then open the answer where it is shown.

Question 1 (NEET 2020, Q1)
EcosystemBotanyEasy
Which of the following is not an attribute of a population?
1. Option A: Sex ratio
2. Option B: Natality
3. Option C: Mortality
4. Option D: Species interaction
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Question 2 (NEET 2020, Q2)
Plant Growth and DevelopmentBotanyEasy
The process of growth is maximum during
1. Option A: Log phase
2. Option B: Lag phase
3. Option C: Senescence
4. Option D: Dormancy
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Question 3 (NEET 2020, Q3)
Morphology of Flowering PlantsBotanyEasy
The roots that originate from the base of the stem are
1. Option A: Fibrous roots
2. Option B: Primary roots
3. Option C: Prop roots
4. Option D: Lateral roots
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Correct answer: (A) Fibrous roots
Explanation
Fibrous roots arise from the base of the stem and are characteristic of monocot plants.
Question 4 (NEET 2020, Q4)
Human Health and DiseaseZoologyMedium
Match the following diseases with the causative organism and select the correct option.
1. Option A: (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
2. Option B: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
3. Option C: (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
4. Option D: (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
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Question 5 (NEET 2020, Q5)
Reproductive HealthZoologyMedium
In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?
1. Option A: ZIFT and IUT
2. Option B: GIFT and ZIFT
3. Option C: ICSI and ZIFT
4. Option D: GIFT and ICSI
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Question 6 (NEET 2020, Q6)
Principles of Inheritance and VariationBotanyMedium
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
1. Option A: The gene (I) has three alleles.
2. Option B: A person will have only two of the three alleles.
3. Option C: When Iᴬ and Iᴮ are present together, they express same type of sugar.
4. Option D: Allele i does not produce any sugar.
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Question 7 (NEET 2020, Q7)
Biotechnology: Principles and ProcessesZoologyEasy
Choose the correct pair from the following.
1. Option A: Ligases - Join the two DNA molecules
2. Option B: Polymerases - Break the DNA into fragments
3. Option C: Nucleases - Separate the two strands of DNA
4. Option D: Exonucleases - Make cuts at specific positions within DNA
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Question 8 (NEET 2020, Q8)
Principles of Inheritance and VariationBotanyMedium
Select the correct match.
1. Option A: Haemophilia - Y linked
2. Option B: Phenylketonuria - Autosomal dominant trait
3. Option C: Sickle cell anaemia - Autosomal recessive trait, chromosome-11
4. Option D: Thalassemia - X linked
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Question 9 (NEET 2020, Q9)
The Living WorldBotanyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
2. Option B: (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
3. Option C: (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
4. Option D: (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
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Question 10 (NEET 2020, Q10)
Human Health and DiseaseZoologyEasy
The infectious stage of Plasmodium that enters the human body is
1. Option A: Trophozoites
2. Option B: Sporozoites
3. Option C: Female gametocytes
4. Option D: Male gametocytes
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Question 11 (NEET 2020, Q11)
BiomoleculesZoologyMedium
Identify the substances having glycosidic bond and peptide bond, respectively in their structure
1. Option A: Chitin, cholesterol
2. Option B: Glycerol, trypsin
3. Option C: Cellulose, lecithin
4. Option D: Inulin, insulin
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Question 12 (NEET 2020, Q12)
Sexual Reproduction in Flowering PlantsBotanyMedium
The plant parts which consist of two generations - one within the other are (a) Pollen grains inside the anther (b) Germinated pollen grain with two male gametes (c) Seed inside the fruit (d) Embryo sac inside the ovuleThe plant parts which consist of two generations - one within the other are (a) Pollen grains inside the anther (b) Germinated pollen grain with two male gametes (c) Seed inside the fruit (d) Embryo sac inside the ovule
1. Option A: (a) only
2. Option B: (a), (b) and (c)
3. Option C: (c) and (d)
4. Option D: (a) and (d)
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Question 13 (NEET 2020, Q13)
Photosynthesis in Higher PlantsBotanyMedium
The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are
1. Option A: Ammonia alone
2. Option B: Nitrate alone
3. Option C: Ammonia and oxygen
4. Option D: Ammonia and hydrogen
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Question 14 (NEET 2020, Q14)
Cell Cycle and Cell DivisionBotanyEasy
Identify the correct statement with regard to $G_1$ phase (Gap 1) of interphase.
1. Option A: DNA synthesis or replication takes place.
2. Option B: Reorganisation of all cell components takes place.
3. Option C: Cell is metabolically active, grows but does not replicate its DNA.
4. Option D: Nuclear division takes place.
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Question 15 (NEET 2020, Q15)
Structural Organisation in AnimalsZoologyEasy
Cuboidal epithelium with brush border of microvilli is found in
1. Option A: Lining of intestine
2. Option B: Ducts of salivary gland
3. Option C: Proximal convoluted tubule of nephron
4. Option D: Eustachian tube
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Question 16 (NEET 2020, Q16)
Cell: The Unit of LifeBotanyMedium
Which of the following statements about inclusion bodies is incorrect?
1. Option A: They are not bound by any membrane
2. Option B: These are involved in ingestion of food particles
3. Option C: They lie free in the cytoplasm
4. Option D: These represent reserve material in cytoplasm
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Question 17 (NEET 2020, Q17)
Cell: The Unit of LifeBotanyEasy
Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?
1. Option A: Endoplasmic reticulum
2. Option B: Peroxisomes
3. Option C: Golgi bodies
4. Option D: Polysomes
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Question 18 (NEET 2020, Q18)
Biotechnology and Its ApplicationsZoologyEasy
In gel electrophoresis, separated DNA fragments can be visualized with the help of
1. Option A: Acetocarmine in bright blue light
2. Option B: Ethidium bromide in UV radiation
3. Option C: Acetocarmine in UV radiation
4. Option D: Ethidium bromide in infrared radiation
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Question 19 (NEET 2020, Q19)
Breathing and Exchange of GasesZoologyMedium
Identify the wrong statement with reference to transport of oxygen
1. Option A: Binding of oxygen with haemoglobin is mainly related to partial pressure of $O_2$
2. Option B: Partial pressure of $CO_2$ can interfere with $O_2$ binding with haemoglobin
3. Option C: Higher $H^+$ concentration in alveoli favours the formation of oxyhaemoglobin
4. Option D: Low $pCO_2$ in alveoli favours the formation of oxyhaemoglobin
Show answer & explanationHide answer & explanation
Correct answer: (C) Higher $H^+$ concentration in alveoli favours the formation of oxyhaemoglobin
Explanation
High H+ concentration reduces the affinity of haemoglobin for oxygen (Bohr effect). Therefore, higher H+ concentration does not favour oxyhaemoglobin formation.
Question 20 (NEET 2020, Q20)
Structural Organisation in AnimalsZoologyEasy
Ray florets have
1. Option A: Inferior ovary
2. Option B: Superior ovary
3. Option C: Hypogynous ovary
4. Option D: Half inferior ovary
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Question 21 (NEET 2020, Q21)
Biotechnology: Principles and ProcessesZoologyMedium
The specific palindromic sequence which is recognized by EcoRI is
1. Option A: 5′- GAATTC -3′ / 3′- CTTAAG -5′
2. Option B: 5′- GGAACC -3′ / 3′- CCTTGG -5′
3. Option C: 5′- CTTAAG -3′ / 3′- GAATTC -5′
4. Option D: 5′- GGATCC -3′ / 3′- CCTAGG -5′
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Question 22 (NEET 2020, Q22)
Biotechnology: Principles and ProcessesZoologyEasy
Identify the wrong statement with regard to Restriction Enzymes.
1. Option A: Each restriction enzyme functions by inspecting the length of a DNA sequence.
2. Option B: They cut the strand of DNA at palindromic sites.
3. Option C: They are useful in genetic engineering.
4. Option D: Sticky ends can be joined by using DNA ligases.
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Question 23 (NEET 2020, Q23)
Microbes in Human WelfareBotanyEasy
Which of the following is put into Anaerobic sludge digester for further sewage treatment?
1. Option A: Primary sludge
2. Option B: Floating debris
3. Option C: Effluents of primary treatment
4. Option D: Activated sludge
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Question 24 (NEET 2020, Q24)
Breathing and Exchange of GasesZoologyMedium
Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases
1. Option A: (a) and (b)
2. Option B: (c) and (d)
3. Option C: (a), (b) and (d)
4. Option D: only (d)
Show answer & explanationHide answer & explanation
Correct answer: (A) (a) and (b)
Explanation
During inspiration, the diaphragm and external intercostal muscles contract, increasing thoracic volume. Pulmonary volume increases and intrapulmonary pressure decreases. Hence only statements (a) and (b) are correct.
Question 25 (NEET 2020, Q25)
Structural Organisation in AnimalsZoologyMedium
If the head of cockroach is removed, it may live for few days because
1. Option A: the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen
2. Option B: the cockroach does not have nervous system
3. Option C: the head holds a small proportion of nervous system while the rest is situated along the ventral part of its body
4. Option D: the head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body
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Question 26 (NEET 2020, Q26)
The Living WorldBotanyMedium
Which of the following statements are true for the phylum-Chordata? (a) In Urochordata notochord extends from head to tail and it is present throughout their life. (b) In Vertebrata notochord is present during the embryonic period only. (c) Central nervous system is dorsal and hollow. (d) Chordata is divided into 3 subphyla : Hemichordata, Tunicata and Cephalochordata.
1. Option A: (d) and (c)
2. Option B: (c) and (a)
3. Option C: (a) and (b)
4. Option D: (b) and (c)
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Question 27 (NEET 2020, Q27)
Biotechnology and Its ApplicationsZoologyMedium
Match the organism with its use in biotechnology.
1. Option A: (a) (ii) (b) (iv) (c) (iii) (d) (i)
2. Option B: (a) (iv) (b) (iii) (c) (i) (d) (ii)
3. Option C: (a) (iii) (b) (ii) (c) (iv) (d) (i)
4. Option D: (a) (iii) (b) (iv) (c) (i) (d) (ii)
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Question 28 (NEET 2020, Q28)
Photosynthesis in Higher PlantsBotanyMedium
Match the following concerning essential elements and their functions in plants: Select the correct option
1. Option A: (a) (ii) (b) (i) (c) (iv) (d) (iii)
2. Option B: (a) (iv) (b) (iii) (c) (ii) (d) (i)
3. Option C: (a) (iii) (b) (iv) (c) (ii) (d) (i)
4. Option D: (a) (iv) (b) (i) (c) (ii) (d) (iii)
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Question 29 (NEET 2020, Q29)
Photosynthesis in Higher PlantsBotanyEasy
Identify the incorrect statement.
1. Option A: (1) Heart wood does not conduct water but gives mechanical support
2. Option B: (2) Sapwood is involved in conduction of water and minerals from root to leaf
3. Option C: (3) Sapwood is the innermost secondary xylem and is lighter in colour
4. Option D: (4) Due to deposition of tannins, resins, oils etc., heart wood is dark in colour
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Question 30 (NEET 2020, Q30)
BiomoleculesZoologyMedium
Match the following: Choose the correct option from the following.
1. Option A: (a) (ii) (b) (iv) (c) (iii) (d) (i)
2. Option B: (a) (iii) (b) (i) (c) (iv) (d) (ii)
3. Option C: (a) (iii) (b) (iv) (c) (i) (d) (ii)
4. Option D: (a) (ii) (b) (iii) (c) (i) (d) (iv)
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Question 31 (NEET 2020, Q31)
Human ReproductionZoologyEasy
Meiotic division of the secondary oocyte is completed: (a) In Ur
1. Option A: (1) Prior to ovulation
2. Option B: (2) At the time of copulation
3. Option C: (3) After zygote formation
4. Option D: (4) At the time of fusion of a sperm with an ovum
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Question 32 (NEET 2020, Q32)
Biodiversity and ConservationBotanyEasy
According to Robert May, the global species diversity is about:
1. Option A: (1) 1.5 million
2. Option B: (2) 20 million
3. Option C: (3) 50 million
4. Option D: (4) 7 million
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Correct answer: (D) (4) 7 million
Explanation
According to Robert May, the estimated global species diversity is approximately 7 million.
Question 33 (NEET 2020, Q33)
Molecular Basis of InheritanceBotanyEasy
The first phase of translation is:
1. Option A: (1) Binding of mRNA to ribosome
2. Option B: (2) Recognition of DNA molecule
3. Option C: (3) Aminoacylation of tRNA
4. Option D: (4) Recognition of an anti-codon
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Question 34 (NEET 2020, Q34)
Biodiversity and ConservationBotanyEasy
Which of the following regions of the globe exhibits highest species diversity?
1. Option A: (1) Western Ghats of India
2. Option B: (2) Madagascar
3. Option C: (3) Himalayas
4. Option D: (4) Amazon forests
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Question 35 (NEET 2020, Q35)
Biotechnology and Its ApplicationsZoologyMedium
Which of the following statements is not correct?
1. Option A: (1) In man insulin is synthesised as a proinsulin
2. Option B: (2) The proinsulin has an extra peptide called C-peptide
3. Option C: (3) The functional insulin has A and B chains linked together by hydrogen bonds
4. Option D: (4) Genetically engineered insulin is produced in E. coli
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Question 36 (NEET 2020, Q36)
Structural Organisation in AnimalsZoologyMedium
The transverse section of a plant shows following anatomical features: (a) Large number of scattered vascular bundles surrounded by bundle sheath (b) Large conspicuous parenchymatous ground tissue (c) Vascular bundles conjoint and closed (d) Phloem parenchyma absent Identify the category of plant and its part:
1. Option A: Monocotyledonous stem
2. Option B: Monocotyledonous root
3. Option C: Dicotyledonous stem
4. Option D: Dicotyledonous root
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Question 37 (NEET 2020, Q37)
Structural Organisation in AnimalsZoologyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. Option B: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
3. Option C: (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
4. Option D: (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
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Question 38 (NEET 2020, Q38)
EvolutionZoologyEasy
From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask:
1. Option A: CH₄, H₂, NH₃ and water vapor at 800°C
2. Option B: CH₃, H₂, NH₄ and water vapor at 800°C
3. Option C: CH₄, H₂, NH₃ and water vapor at 600°C
4. Option D: CH₃, H₂, NH₃ and water vapor at 600°C
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Correct answer: (A) CH₄, H₂, NH₃ and water vapor at 800°C
Explanation
In the Miller-Urey experiment, methane (CH₄), hydrogen (H₂), ammonia (NH₃), and water vapor were subjected to high temperature and electric discharge in a closed system to simulate primitive Earth conditions. Amino acids were formed under these conditions. Therefore, option (A) is correct.
Question 39 (NEET 2020, Q39)
EvolutionZoologyEasy
Embryological support for evolution was disproved by:
1. Option A: Karl Ernst von Baer
2. Option B: Alfred Wallace
3. Option C: Charles Darwin
4. Option D: Oparin
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Correct answer: (A) Karl Ernst von Baer
Explanation
Karl Ernst von Baer disproved Haeckel's biogenetic law and provided corrected embryological interpretations.
Question 40 (NEET 2020, Q40)
Photosynthesis in Higher PlantsBotanyEasy
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is:
1. Option A: Transpiration
2. Option B: Root pressure
3. Option C: Imbibition
4. Option D: Plasmolysis
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Question 41 (NEET 2020, Q41)
BiomoleculesZoologyEasy
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:
1. Option A: Nutritive value
2. Option B: Growth response
3. Option C: Defence action
4. Option D: Effect on reproduction
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Question 42 (NEET 2020, Q42)
Photosynthesis in Higher PlantsBotanyMedium
The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of:
1. Option A: 2 molecules of 3-C compound
2. Option B: 1 molecule of 3-C compound
3. Option C: 1 molecule of 6-C compound
4. Option D: 1 molecule of 4-C compound and 1 molecule of 2-C compound
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Question 43 (NEET 2020, Q43)
Biotechnology and Its ApplicationsZoologyEasy
Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to:
1. Option A: Insect pests
2. Option B: Fungal diseases
3. Option C: Plant nematodes
4. Option D: Insect predators
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Question 44 (NEET 2020, Q44)
EvolutionZoologyMedium
Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action? (a) Darwin's Finches of Galapagos islands (b) Herbicide resistant weeds (c) Drug resistant eukaryotes (d) Man-created breeds of domesticated animals like dogs.
1. Option A: only (a)
2. Option B: (a) and (c)
3. Option C: (b), (c) and (d)
4. Option D: only (d)
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Correct answer: (C) (b), (c) and (d)
Explanation
Herbicide resistant weeds, drug resistant eukaryotes and domesticated breeds are examples of evolution influenced by anthropogenic activities.
Question 45 (NEET 2020, Q45)
Microbes in Human WelfareBotanyEasy
Identify the wrong statement with reference to immunity.
1. Option A: (1) When exposed to antigen (living or dead) antibodies are produced in the host’s body. It is called "Active immunity"
2. Option B: (2) When ready-made antibodies are directly given, it is called "Passive immunity".
3. Option C: (3) Active immunity is quick and gives full response.
4. Option D: (4) Foetus receives some antibodies from mother, it is an example for passive immunity.
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Question 46 (NEET 2020, Q46)
Microbes in Human WelfareBotanyEasy
By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams?
1. Option A: Out crossing
2. Option B: Mutational breeding
3. Option C: Cross breeding
4. Option D: Inbreeding
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Question 47 (NEET 2020, Q47)
Body Fluids and CirculationZoologyEasy
Identify the correct statement with reference to human digestive system.
1. Option A: (1) Ileum opens into small intestine
2. Option B: (2) Serosa is the innermost layer of the alimentary canal
3. Option C: (3) Ileum is a highly coiled part
4. Option D: (4) Vermiform appendix arises from duodenum
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Question 48 (NEET 2020, Q48)
Microbes in Human WelfareBotanyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
2. Option B: (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
3. Option C: (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
4. Option D: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
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Question 49 (NEET 2020, Q49)
Excretory Products and Their EliminationZoologyEasy
Presence of which of the following conditions in urine are indicative of Diabetes Mellitus?
1. Option A: Uremia and Ketonuria
2. Option B: Uremia and Renal Calculi
3. Option C: Ketonuria and Glycosuria
4. Option D: Renal calculi and Hyperglycaemia
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Correct answer: (C) Ketonuria and Glycosuria
Explanation
Diabetes mellitus is characterized by the presence of glucose and ketone bodies in urine, known as glycosuria and ketonuria respectively.
Question 50 (NEET 2020, Q50)
The Living WorldBotanyMedium
Floridean starch has structure similar to:
1. Option A: Starch and cellulose
2. Option B: Amylopectin and glycogen
3. Option C: Mannitol and algin
4. Option D: Laminarin and cellulose
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Question 51 (NEET 2020, Q51)
Microbes in Human WelfareBotanyEasy
Select the option including all sexually transmitted diseases.
1. Option A: Gonorrhoea, Syphilis, Genital herpes
2. Option B: Gonorrhoea, Malaria, Genital herpes
3. Option C: AIDS, Malaria, Filaria
4. Option D: Cancer, AIDS, Syphilis
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Question 52 (NEET 2020, Q52)
Cell: The Unit of LifeBotanyMedium
Match the following with respect to meiosis: Select the correct option from the following.
1. Option A: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
2. Option B: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
3. Option C: (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
4. Option D: (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
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Question 53 (NEET 2020, Q53)
The Living WorldBotanyMedium
Which of the following pairs is of unicellular algae?
1. Option A: Laminaria and Sargassum
2. Option B: Gelidium and Gracilaria
3. Option C: Anabaena and Volvox
4. Option D: Chlorella and Spirulina
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Question 54 (NEET 2020, Q54)
Chemical Coordination and IntegrationZoologyEasy
Which of the following hormone levels will cause release of ovum (ovulation) from the graafian follicle?
1. Option A: High concentration of Estrogen
2. Option B: High concentration of Progesterone
3. Option C: Low concentration of LH
4. Option D: Low concentration of FSH
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Correct answer: (A) High concentration of Estrogen
Explanation
A high level of estrogen stimulates the anterior pituitary gland to produce a surge of LH, which induces ovulation and release of the ovum from the graafian follicle.
Question 55 (NEET 2020, Q55)
Biotechnology and Its ApplicationsZoologyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
2. Option B: (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
3. Option C: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
4. Option D: (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
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Question 56 (NEET 2020, Q56)
EcosystemBotanyEasy
Montreal protocol was signed in 1987 for control of
1. Option A: Transport of genetically modified organisms from one country to another
2. Option B: Emission of ozone depleting substances
3. Option C: Release of greenhouse gases
4. Option D: Disposal of e-wastes
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Question 57 (NEET 2020, Q57)
The Living WorldBotanyEasy
Which of the following is correct about viroids?
1. Option A: They have RNA with protein coat
2. Option B: They have free RNA without protein coat
3. Option C: They have DNA with protein coat
4. Option D: They have free DNA without protein coat
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Question 58 (NEET 2020, Q58)
Structural Organisation in AnimalsZoologyEasy
The ovary is half inferior in:
1. Option A: Brinjal
2. Option B: Mustard
3. Option C: Sunflower
4. Option D: Plum
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Question 59 (NEET 2020, Q59)
Body Fluids and CirculationZoologyEasy
The enzyme enterokinase helps in conversion of
1. Option A: protein into polypeptides
2. Option B: trypsinogen into trypsin
3. Option C: caseinogen into casein
4. Option D: pepsinogen into pepsin
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Question 60 (NEET 2020, Q60)
EcosystemBotanyMedium
Match the trophic levels with their correct species examples in grassland ecosystem. Select the correct option.
1. Option A: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. Option B: (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
3. Option C: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
4. Option D: (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
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Question 61 (NEET 2020, Q61)
Principles of Inheritance and VariationBotanyEasy
How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?
1. Option A: 4
2. Option B: 2
3. Option C: 14
4. Option D: 8
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Question 62 (NEET 2020, Q62)
Neural Control and CoordinationZoologyMedium
Match the following columns and select the correct option.
1. Option A: (a) (ii) (b) (iii) (c) (i) (d) (iv)
2. Option B: (a) (iii) (b) (i) (c) (iv) (d) (ii)
3. Option C: (a) (iv) (b) (ii) (c) (i) (d) (iii)
4. Option D: (a) (i) (b) (ii) (c) (iv) (d) (iii)
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Correct answer: (C) (a) (iv) (b) (ii) (c) (i) (d) (iii)
Explanation
The Organ of Corti is located on the basilar membrane. Cochlea is the coiled part of the labyrinth. Eustachian tube connects the middle ear and pharynx. Stapes is attached to the oval window.
Question 63 (NEET 2020, Q63)
Sexual Reproduction in Flowering PlantsBotanyEasy
In water hyacinth and water lily, pollination takes place by:
1. Option A: Insects or wind
2. Option B: Water currents only
3. Option C: Wind and water
4. Option D: Insects and water
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Question 64 (NEET 2020, Q64)
Plant Growth and DevelopmentBotanyEasy
Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.
1. Option A: Cytokinin
2. Option B: Gibberellin
3. Option C: Ethylene
4. Option D: Abscisic acid
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Question 65 (NEET 2020, Q65)
Photosynthesis in Higher PlantsBotanyMedium
In light reaction, plastoquinone facilitates the transfer of electrons from:
1. Option A: PS-II to Cytb $_6f$ complex
2. Option B: Cytb $_6f$ complex to PS-I
3. Option C: PS-I to NADP $^+$
4. Option D: PS-I to ATP synthase
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Question 66 (NEET 2020, Q66)
Photosynthesis in Higher PlantsBotanyEasy
Which of the following is not an inhibitory substance governing seed dormancy?
1. Option A: Gibberellic acid
2. Option B: Abscisic acid
3. Option C: Phenolic acid
4. Option D: Para-ascorbic acid
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Question 67 (NEET 2020, Q67)
Molecular Basis of InheritanceBotanyEasy
Name the enzyme that facilitates opening of DNA helix during transcription.
1. Option A: DNA ligase
2. Option B: DNA helicase
3. Option C: DNA polymerase
4. Option D: RNA polymerase
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Question 68 (NEET 2020, Q68)
Excretory Products and Their EliminationZoologyMedium
Which of the following would help in prevention of diuresis?
1. Option A: More water reabsorption due to undersecretion of ADH
2. Option B: Reabsorption of Na $^+$ and water from renal tubules due to aldosterone
3. Option C: Atrial natriuretic factor causes vasoconstriction
4. Option D: Decrease in secretion of renin by JG cells
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Correct answer: (B) Reabsorption of Na $^+$ and water from renal tubules due to aldosterone
Explanation
Aldosterone increases reabsorption of sodium and water from renal tubules, thereby reducing urine output and preventing diuresis.
Question 69 (NEET 2020, Q69)
EcosystemBotanyEasy
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
1. Option A: Gross primary productivity is always less than net primary productivity
2. Option B: Gross primary productivity is always more than net primary productivity
3. Option C: Gross primary productivity and Net primary productivity are one and same
4. Option D: There is no relationship between Gross primary productivity and Net primary productivity
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Question 70 (NEET 2020, Q70)
Human ReproductionZoologyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
2. Option B: (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
3. Option C: (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
4. Option D: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
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Question 71 (NEET 2020, Q71)
The Living WorldBotanyEasy
Strobili or cones are found in
1. Option A: Salvinia
2. Option B: Pteris
3. Option C: Marchantia
4. Option D: Equisetum
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Question 72 (NEET 2020, Q72)
Cell Cycle and Cell DivisionBotanyMedium
Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G₀). This process occurs at the end of
1. Option A: M phase
2. Option B: G₁ phase
3. Option C: S phase
4. Option D: G₂ phase
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Question 73 (NEET 2020, Q73)
EvolutionZoologyEasy
Flippers of Penguins and Dolphins are examples of
1. Option A: Adaptive radiation
2. Option B: Convergent evolution
3. Option C: Industrial melanism
4. Option D: Natural selection
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Correct answer: (B) Convergent evolution
Explanation
Penguins and dolphins evolved similar flipper-like structures independently in different evolutionary lineages due to similar environmental pressures, demonstrating convergent evolution.
Question 74 (NEET 2020, Q74)
Molecular Basis of InheritanceBotanyMedium
If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10 $^9$ bp, then the length of the DNA is approximately
1. Option A: 2.0 meters
2. Option B: 2.5 meters
3. Option C: 2.2 meters
4. Option D: 2.7 meters
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Question 75 (NEET 2020, Q75)
Body Fluids and CirculationZoologyEasy
The QRS complex in a standard ECG represents
1. Option A: Repolarisation of auricles
2. Option B: Depolarisation of auricles
3. Option C: Depolarisation of ventricles
4. Option D: Repolarisation of ventricles
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Question 76 (NEET 2020, Q76)
Body Fluids and CirculationZoologyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
2. Option B: (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
3. Option C: (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
4. Option D: (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
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Question 77 (NEET 2020, Q77)
Molecular Basis of InheritanceBotanyEasy
Which of the following statements is correct?
1. Option A: Adenine pairs with thymine through two H-bonds
2. Option B: Adenine pairs with thymine through one H-bond
3. Option C: Adenine pairs with thymine through three H-bonds
4. Option D: Adenine does not pair with thymine
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Question 78 (NEET 2020, Q78)
Biotechnology: Principles and ProcessesZoologyMedium
The sequence that controls the copy number of the linked DNA in the vector, is termed
1. Option A: Selectable marker
2. Option B: Ori site
3. Option C: Palindromic sequence
4. Option D: Recognition site
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Question 79 (NEET 2020, Q79)
BiomoleculesZoologyEasy
Identify the basic amino acid from the following.
1. Option A: Tyrosine
2. Option B: Glutamic Acid
3. Option C: Lysine
4. Option D: Valine
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Question 80 (NEET 2020, Q80)
Chemical Coordination and IntegrationZoologyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
2. Option B: (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
3. Option C: (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
4. Option D: (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
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Correct answer: (C) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
Explanation
Pituitary gland disorders can cause diabetes insipidus, thyroid gland hyperactivity causes Grave’s disease, adrenal gland insufficiency causes Addison’s disease, and pancreatic dysfunction leads to diabetes mellitus.
Question 81 (NEET 2020, Q81)
Chemical Coordination and IntegrationZoologyEasy
Select the correct statement.
1. Option A: Glucocorticoids stimulate gluconeogenesis.
2. Option B: Glucagon is associated with hypoglycemia.
3. Option C: Insulin acts on pancreatic cells and adipocytes.
4. Option D: Insulin is associated with hyperglycemia.
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Correct answer: (A) Glucocorticoids stimulate gluconeogenesis.
Explanation
Glucocorticoids stimulate gluconeogenesis, which increases blood glucose levels. Glucagon is associated with hyperglycemia, and insulin lowers blood glucose concentration.
Question 82 (NEET 2020, Q82)
BiomoleculesZoologyEasy
Which one of the following is the most abundant protein in the animals?
1. Option A: Haemoglobin
2. Option B: Collagen
3. Option C: Lectin
4. Option D: Insulin
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Question 83 (NEET 2020, Q83)
Principles of Inheritance and VariationBotanyEasy
Experimental verification of the chromosomal theory of inheritance was done by
1. Option A: Mendel
2. Option B: Sutton
3. Option C: Boveri
4. Option D: Morgan
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Question 84 (NEET 2020, Q84)
Structural Organisation in AnimalsZoologyMedium
Match the following columns and select the correct option.
1. Option A: (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
2. Option B: (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
3. Option C: (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
4. Option D: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
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Question 85 (NEET 2020, Q85)
Respiration in PlantsBotanyMedium
The number of substrate level phosphorylations in one turn of citric acid cycle is
1. Option A: Zero
2. Option B: One
3. Option C: Two
4. Option D: Three
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Correct answer: (B) One
Explanation
Only one substrate-level phosphorylation occurs in one turn of the citric acid cycle during the conversion of succinyl-CoA to succinate.
Question 86 (NEET 2020, Q86)
Cell Cycle and Cell DivisionBotanyMedium
Dissolution of the synaptonemal complex occurs during
1. Option A: Pachytene
2. Option B: Zygotene
3. Option C: Diplotene
4. Option D: Leptotene
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Question 87 (NEET 2020, Q87)
The Living WorldBotanyEasy
Bilaterally symmetrical and acoelomate animals are exemplified by
1. Option A: Ctenophora
2. Option B: Platyhelminthes
3. Option C: Aschelminthes
4. Option D: Annelida
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Question 88 (NEET 2020, Q88)
Sexual Reproduction in Flowering PlantsBotanyMedium
The body of the ovule is fused within the funicle at
1. Option A: Hilum
2. Option B: Micropyle
3. Option C: Nucellus
4. Option D: Chalaza
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Question 89 (NEET 2020, Q89)
Structural Organisation in AnimalsZoologyEasy
Goblet cells of alimentary canal are modified from
1. Option A: Squamous epithelial cells
2. Option B: Columnar epithelial cells
3. Option C: Chondrocytes
4. Option D: Compound epithelial cells
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Question 90 (NEET 2020, Q90)
Neural Control and CoordinationZoologyMedium
Snow-blindness in Antarctic region is due to
1. Option A: Freezing of fluids in the eye by low temperature
2. Option B: Inflammation of cornea due to high dose of UV-B radiation
3. Option C: High reflection of light from snow
4. Option D: Damage to retina caused by infra-red rays
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Correct answer: (B) Inflammation of cornea due to high dose of UV-B radiation
Explanation
Snow blindness is caused by inflammation of the cornea due to excessive exposure to ultraviolet-B radiation reflected from snow.

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