NEET 2021 · Biology

NEET 2021 Biology Questions with Solutions

The NEET 2021 paper had 100 Biology questions from 25 chapters. By section: 49 Botany and 51 Zoology.

Molecular Basis of Inheritance and The Living World had the most questions (9 each), followed by Biotechnology: Principles and Processes and Structural Organisation in Animals with 7 each.

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

Practise NEET 2021 Biology free

Biology questions: 100
Chapters covered: 25
Solved free here: 26 of 100
Easy / Medium / Hard: 57 / 37 / 6

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

Chapter-wise: NEET 2021 Biology

How many questions each chapter had in NEET 2021. Open a chapter for its questions from every year.

All 100 NEET 2021 Biology questions

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

Question 1 (NEET 2021, Q61)
BiomoleculesZoologyEasy
The RBC deficiency disease is deficiency disease of:
1. Option A: Vitamin B₂
2. Option B: Vitamin B₁₂
3. Option C: Vitamin B₆
4. Option D: Vitamin B₁
The answer and explanation for this question are in NEET MIND Premium.
Question 2 (NEET 2021, Q101)
EcosystemBotanyEasy
Which of the following statements is not correct?
1. Option A: Pyramid of numbers in a grassland ecosystem is upright.
2. Option B: Pyramid of biomass in sea is generally inverted.
3. Option C: Pyramid of biomass in sea is generally upright.
4. Option D: Pyramid of energy is always upright.
The answer and explanation for this question are in NEET MIND Premium.
Question 3 (NEET 2021, Q102)
The Living WorldBotanyEasy
Which of the following plants is monoecious?
1. Option A: Cycas circinalis
2. Option B: Carica papaya
3. Option C: Chara
4. Option D: Marchantia polymorpha
The answer and explanation for this question are in NEET MIND Premium.
Question 4 (NEET 2021, Q103)
Photosynthesis in Higher PlantsBotanyEasy
The first stable product of $CO_2$ fixation in Sorghum is
1. Option A: Phosphoglyceric acid
2. Option B: Pyruvic acid
3. Option C: Oxaloacetic acid
4. Option D: Succinic acid
The answer and explanation for this question are in NEET MIND Premium.
Question 5 (NEET 2021, Q104)
Structural Organisation in AnimalsBotanyMedium
Diadelphous stamens are found in
1. Option A: China rose and citrus
2. Option B: China rose
3. Option C: Citrus
4. Option D: Pea
The answer and explanation for this question are in NEET MIND Premium.
Question 6 (NEET 2021, Q105)
Biotechnology: Principles and ProcessesBotanyEasy
DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as
1. Option A: Bright blue bands
2. Option B: Yellow bands
3. Option C: Bright orange bands
4. Option D: Dark red bands
The answer and explanation for this question are in NEET MIND Premium.
Question 7 (NEET 2021, Q106)
Plant Growth and DevelopmentBotanyEasy
Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called
1. Option A: Maturity
2. Option B: Elasticity
3. Option C: Flexibility
4. Option D: Plasticity
Show answer & explanationHide answer & explanation
Correct answer: (D) Plasticity
Explanation
Plasticity refers to the ability of plants to follow different developmental pathways in response to environmental conditions or different life phases.
Question 8 (NEET 2021, Q107)
Biotechnology and Its ApplicationsBotanyEasy
Match List-I with List-II
1. Option A: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. Option B: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. Option C: (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
4. Option D: (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
Show answer & explanationHide answer & explanation
Correct answer: (C) (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
Explanation
Tomato is obtained through protoplast fusion. Totipotency is the basis of plant tissue culture. Virus-free plants are produced using meristem culture. Somaclones are produced through micropropagation.
Question 9 (NEET 2021, Q108)
EcosystemBotanyEasy
In the equation GPP - R = NPP, R represents:
1. Option A: Respiration losses
2. Option B: Radiant energy
3. Option C: Retardation factor
4. Option D: Environmental factor
The answer and explanation for this question are in NEET MIND Premium.
Question 10 (NEET 2021, Q109)
Principles of Inheritance and VariationBotanyEasy
The production of gametes by the parents, formation of zygotes, the $F_1$ and $F_2$ plants, can be understood from a diagram called:
1. Option A: Net square
2. Option B: Bullet square
3. Option C: Punch square
4. Option D: Punnett square
The answer and explanation for this question are in NEET MIND Premium.
Question 11 (NEET 2021, Q110)
Cell: The Unit of LifeBotanyMedium
Which of the following is an incorrect statement?
1. Option A: Nuclear pores act as passages for proteins and RNA molecules in both directions between nucleus and cytoplasm
2. Option B: Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles
3. Option C: Microbodies are present both in plant and animal cells
4. Option D: The perinuclear space forms a barrier between the materials present inside the nucleus and that of the cytoplasm
The answer and explanation for this question are in NEET MIND Premium.
Question 12 (NEET 2021, Q111)
Structural Organisation in AnimalsBotanyEasy
Match List-I with List-II.
1. Option A: (a) → (iv), (b) → (ii), (c) → (i), (d) → (iii)
2. Option B: (a) → (iv), (b) → (i), (c) → (iii), (d) → (ii)
3. Option C: (a) → (iii), (b) → (i), (c) → (iv), (d) → (ii)
4. Option D: (a) → (ii), (b) → (iii), (c) → (iv), (d) → (i)
The answer and explanation for this question are in NEET MIND Premium.
Question 13 (NEET 2021, Q112)
EcosystemBotanyEasy
The amount of nutrients such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time is referred as:
1. Option A: Standing crop
2. Option B: Climax
3. Option C: Climax community
4. Option D: Standing state
The answer and explanation for this question are in NEET MIND Premium.
Question 14 (NEET 2021, Q113)
Sexual Reproduction in Flowering PlantsBotanyEasy
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is:
1. Option A: Cleistogamy
2. Option B: Xenogamy
3. Option C: Geitonogamy
4. Option D: Chasmogamy
The answer and explanation for this question are in NEET MIND Premium.
Question 15 (NEET 2021, Q114)
Cell Cycle and Cell DivisionBotanyEasy
Which of the following stages of meiosis involves division of centromere?
1. Option A: Telophase II
2. Option B: Metaphase I
3. Option C: Metaphase II
4. Option D: Anaphase II
Show answer & explanationHide answer & explanation
Correct answer: (D) Anaphase II
Explanation
Division of centromere occurs during Anaphase II of meiosis when sister chromatids separate and move toward opposite poles. In Metaphase I homologous chromosomes align at the equatorial plate, while in Metaphase II chromosomes align again before separation. Telophase II is the final stage where chromosomes reach the poles and nuclei reform.
Question 16 (NEET 2021, Q115)
Biotechnology: Principles and ProcessesBotanyEasy
Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?
1. Option A: Annealing, Denaturation, Extension
2. Option B: Denaturation, Annealing, Extension
3. Option C: Denaturation, Extension, Annealing
4. Option D: Extension, Denaturation, Annealing
The answer and explanation for this question are in NEET MIND Premium.
Question 17 (NEET 2021, Q116)
Biotechnology and Its ApplicationsBotanyEasy
When gene targeting involving gene amplification is attempted in an individual's tissue to treat disease, it is known as:
1. Option A: Safety testing
2. Option B: Biopiracy
3. Option C: Gene therapy
4. Option D: Molecular diagnosis
The answer and explanation for this question are in NEET MIND Premium.
Question 18 (NEET 2021, Q117)
Cell: The Unit of LifeBotanyEasy
Match List-I with List-II. Choose the correct answer from the options given below:
1. Option A: (1) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. Option B: (2) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
3. Option C: (3) (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
4. Option D: (4) (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
The answer and explanation for this question are in NEET MIND Premium.
Question 19 (NEET 2021, Q118)
EvolutionBotanyEasy
The factor that leads to Founder effect in a population is:
1. Option A: Genetic drift
2. Option B: Natural selection
3. Option C: Genetic recombination
4. Option D: Mutation
Show answer & explanationHide answer & explanation
Correct answer: (A) Genetic drift
Explanation
Founder effect is a consequence of genetic drift when a few individuals establish a new population.
Question 20 (NEET 2021, Q119)
Cell: The Unit of LifeBotanyEasy
When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as:
1. Option A: Acrocentric
2. Option B: Metacentric
3. Option C: Telocentric
4. Option D: Sub-metacentric
The answer and explanation for this question are in NEET MIND Premium.
Question 21 (NEET 2021, Q120)
Sexual Reproduction in Flowering PlantsBotanyMedium
Gemmae are present in:
1. Option A: Some Liverworts
2. Option B: Mosses
3. Option C: Pteridophytes
4. Option D: Some Gymnosperms
The answer and explanation for this question are in NEET MIND Premium.
Question 22 (NEET 2021, Q121)
Biotechnology: Principles and ProcessesBotanyEasy
During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out:
1. Option A: Polysaccharides
2. Option B: RNA
3. Option C: DNA
4. Option D: Histones
The answer and explanation for this question are in NEET MIND Premium.
Question 23 (NEET 2021, Q122)
Photosynthesis in Higher PlantsBotanyEasy
Match List-I with List-II. Choose the correct answer from the options given below.
1. Option A: (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
2. Option B: (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
3. Option C: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
4. Option D: (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
The answer and explanation for this question are in NEET MIND Premium.
Question 24 (NEET 2021, Q123)
Plant Growth and DevelopmentBotanyEasy
The site of perception of light in plants during photoperiodism is:
1. Option A: Leaf
2. Option B: Shoot apex
3. Option C: Stem
4. Option D: Axillary bud
Show answer & explanationHide answer & explanation
Correct answer: (A) Leaf
Explanation
Leaves perceive light stimulus during photoperiodism. In contrast, vernalisation stimulus is perceived by shoot apex and embryo.
Question 25 (NEET 2021, Q124)
Plant Growth and DevelopmentBotanyEasy
The plant hormone used to destroy weeds in a field is:
1. Option A: IBA
2. Option B: IAA
3. Option C: NAA
4. Option D: 2,4-D
Show answer & explanationHide answer & explanation
Correct answer: (D) 2,4-D
Explanation
2,4-D is a synthetic auxin used as a weedicide to remove broad-leaved weeds. IAA and IBA are natural auxins, while NAA is a synthetic auxin but not commonly used as a weedicide.
Question 26 (NEET 2021, Q125)
The Living WorldBotanyEasy
Which of the following algae produce carrageen?
1. Option A: Blue-green algae
2. Option B: Green algae
3. Option C: Brown algae
4. Option D: Red algae
The answer and explanation for this question are in NEET MIND Premium.
Question 27 (NEET 2021, Q126)
Molecular Basis of InheritanceBotanyEasy
Complete the flow chart on central dogma.
1. Option A: (a)-Translation; (b)-Translation; (c)-Replication; (d)-Protein
2. Option B: (a)-Replication; (b)-Transcription; (c)-Transduction; (d)-Protein
3. Option C: (a)-Translation; (b)-Replication; (c)-Transcription; (d)-Transduction
4. Option D: (a)-Replication; (b)-Transcription; (c)-Translation; (d)-Protein
The answer and explanation for this question are in NEET MIND Premium.
Question 28 (NEET 2021, Q127)
Cell: The Unit of LifeBotanyEasy
Which of the following are not secondary metabolites in plants?
1. Option A: Rubber, gums
2. Option B: Morphine, codeine
3. Option C: Amino acids, glucose
4. Option D: Vinblastin, curcumin
The answer and explanation for this question are in NEET MIND Premium.
Question 29 (NEET 2021, Q128)
Organisms and PopulationsBotanyEasy
Inspite of interspecific competition in nature, which mechanism did the competing species might have evolved for their survival?
1. Option A: Predation
2. Option B: Resource partitioning
3. Option C: Competitive release
4. Option D: Mutualism
Show answer & explanationHide answer & explanation
Correct answer: (B) Resource partitioning
Explanation
Competing species can coexist by evolving resource partitioning, where they use different resources or use the same resource in different ways. This reduces direct competition.
Question 30 (NEET 2021, Q129)
Biotechnology: Principles and ProcessesBotanyEasy
Which of the following is not an application of PCR (Polymerase Chain Reaction)?
1. Option A: Detection of gene mutation
2. Option B: Molecular diagnosis
3. Option C: Gene amplification
4. Option D: Purification of isolated protein
The answer and explanation for this question are in NEET MIND Premium.
Question 31 (NEET 2021, Q130)
Structural Organisation in AnimalsBotanyMedium
Match List-I with List-II. Select the correct answer from the options given below
1. Option A: (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
2. Option B: (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
3. Option C: (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
4. Option D: (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
The answer and explanation for this question are in NEET MIND Premium.
Question 32 (NEET 2021, Q131)
Sexual Reproduction in Flowering PlantsBotanyEasy
A typical angiosperm embryo sac at maturity is:
1. Option A: 8-nucleate and 8-celled
2. Option B: 8-nucleate and 7-celled
3. Option C: 7-nucleate and 8-celled
4. Option D: 7-nucleate and 7-celled
The answer and explanation for this question are in NEET MIND Premium.
Question 33 (NEET 2021, Q132)
The Living WorldBotanyEasy
Which of the following algae contains mannitol as reserve food material?
1. Option A: Ulothrix
2. Option B: Ectocarpus
3. Option C: Gracilaria
4. Option D: Volvox
The answer and explanation for this question are in NEET MIND Premium.
Question 34 (NEET 2021, Q133)
The Living WorldBotanyEasy
Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as:
1. Option A: Heterosporous
2. Option B: Homosporous
3. Option C: Heterosorous
4. Option D: Homosporous
The answer and explanation for this question are in NEET MIND Premium.
Question 35 (NEET 2021, Q134)
Principles of Inheritance and VariationBotanyEasy
Mutations in plant cells can be induced by:
1. Option A: Zeatin
2. Option B: Kinetin
3. Option C: Infrared rays
4. Option D: Gamma rays
The answer and explanation for this question are in NEET MIND Premium.
Question 36 (NEET 2021, Q135)
Organisms and PopulationsBotanyEasy
Amensalism can be represented as:
1. Option A: Species A (+); Species B (0)
2. Option B: Species A (-); Species B (0)
3. Option C: Species A (+); Species B (+)
4. Option D: Species A (-); Species B (-)
Show answer & explanationHide answer & explanation
Correct answer: (B) Species A (-); Species B (0)
Explanation
Amensalism is an interaction where one species is harmed while the other remains unaffected. Hence (-,0) is correct.
Question 37 (NEET 2021, Q136)
Molecular Basis of InheritanceBotanyMedium
What is the role of RNA polymerase III in the process of transcription in eukaryotes?
1. Option A: Transcribes only snRNAs
2. Option B: Transcribes rRNAs (28S, 18S and 5.8S)
3. Option C: Transcribes tRNA, 5S rRNA and snRNA
4. Option D: Transcribes precursor of mRNA
The answer and explanation for this question are in NEET MIND Premium.
Question 38 (NEET 2021, Q137)
Anatomy of Flowering PlantsBotanyMedium
Select the correct pair.
1. Option A: Loose parenchyma cells rupturing epidermis and forming lens-shaped opening in bark — Spongy parenchyma
2. Option B: Large colourless empty cells in epidermis of grass leaves — Subsidiary cells
3. Option C: In dicot leaves, vascular bundles are surrounded by large thick-walled cells — Conjunctive tissue
4. Option D: Cells of medullary rays that form part of cambial ring — Interfascicular cambium
Show answer & explanationHide answer & explanation
Correct answer: (D) Cells of medullary rays that form part of cambial ring — Interfascicular cambium
Explanation
Interfascicular cambium develops from medullary ray cells and forms part of the cambial ring. Other pairs are incorrectly matched.
Question 39 (NEET 2021, Q138)
Biotechnology: Principles and ProcessesBotanyHard
Plasmid pBR322 has PstI restriction enzyme site within gene amp^r that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactosidase production and the recombinant plasmid is inserted in an E.coli strain:
1. Option A: It will be able to produce a novel protein with dual ability
2. Option B: It will not be able to confer ampicillin resistance to the host cell
3. Option C: The transformed cells will resist ampicillin as well as produce β-galactosidase
4. Option D: It will lead to lysis of host cell
The answer and explanation for this question are in NEET MIND Premium.
Question 40 (NEET 2021, Q139)
Molecular Basis of InheritanceBotanyEasy
DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as:
1. Option A: Polymorphic DNA
2. Option B: Satellite DNA
3. Option C: Repetitive DNA
4. Option D: Single nucleotides
The answer and explanation for this question are in NEET MIND Premium.
Question 41 (NEET 2021, Q140)
Organisms and PopulationsBotanyEasy
In the exponential growth equation $N_t = N_0 e^{rt}$ , $e$ represents:
1. Option A: The base of geometric logarithms
2. Option B: The base of number logarithms
3. Option C: The base of exponential logarithms
4. Option D: The base of natural logarithms
Show answer & explanationHide answer & explanation
Correct answer: (D) The base of natural logarithms
Explanation
In the exponential population growth equation: $N_t = N_0 e^{rt}$ where: - $N_t$ = population density after time $t$ - $N_0$ = initial population density - $r$ = intrinsic rate of natural increase - $t$ = time - $e$ = base of natural logarithms (approximately $2.718$ ) Therefore, the correct answer is **Option (D)**.
Question 42 (NEET 2021, Q141)
Photosynthesis in Higher PlantsBotanyEasy
Which of the following statements is incorrect?
1. Option A: Cyclic photophosphorylation involves both PS I and PS II
2. Option B: Both ATP and NADPH + $H^+$ are synthesized during non-cyclic photophosphorylation
3. Option C: Stroma lamellae have PS I only and lack NADP reductase
4. Option D: Grana lamellae have both PS I and PS II
The answer and explanation for this question are in NEET MIND Premium.
Question 43 (NEET 2021, Q142)
Sexual Reproduction in Flowering PlantsBotanyEasy
Which of the following statements is correct?
1. Option A: Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells.
2. Option B: Fusion of two cells is called karyogamy.
3. Option C: Fusion of protoplasms between two motile or non-motile gametes is called plasmogamy.
4. Option D: Organisms that depend on living plants are called saprophytes.
The answer and explanation for this question are in NEET MIND Premium.
Question 44 (NEET 2021, Q143)
Photosynthesis in Higher PlantsBotanyEasy
Match Column-I with Column-II. Choose the correct answer from the options given below.Match Column-I with Column-II. Choose the correct answer from the options given below.
1. Option A: (1) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. Option B: (2) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
3. Option C: (3) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. Option D: (4) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
The answer and explanation for this question are in NEET MIND Premium.
Question 45 (NEET 2021, Q144)
Respiration in PlantsBotanyEasy
Which of the following statements is incorrect?
1. Option A: Oxidation-reduction reactions produce proton gradient in respiration
2. Option B: During aerobic respiration, role of oxygen is limited to the terminal stage
3. Option C: In ETC (Electron Transport Chain), one molecule of NADH + $H^+$ gives rise to 2 ATP molecules, and one $FADH_2$ gives rise to 3 ATP molecules
4. Option D: ATP is synthesized through Complex V
Show answer & explanationHide answer & explanation
Correct answer: (C) In ETC (Electron Transport Chain), one molecule of NADH + $H^+$ gives rise to 2 ATP molecules, and one $FADH_2$ gives rise to 3 ATP molecules
Explanation
Statement (3) is incorrect. In oxidative phosphorylation: - One molecule of NADH + H^+ produces approximately 3 ATP molecules (traditional NCERT value). - One molecule of FADH_2 produces approximately 2 ATP molecules. The statement reverses these values. Statement (1) is correct because electron transport through redox reactions creates a proton gradient. Statement (2) is correct because oxygen acts as the terminal electron acceptor in the final stage of aerobic respiration. Statement (4) is correct because ATP synthase (Complex V) synthesizes ATP.
Question 46 (NEET 2021, Q145)
Sexual Reproduction in Flowering PlantsBotanyEasy
In some members of which of the following pairs of families, pollen grains retain their viability for months after release?
1. Option A: Rosaceae ; Leguminosae
2. Option B: Poaceae ; Rosaceae
3. Option C: Poaceae ; Leguminosae
4. Option D: Poaceae ; Solanaceae
The answer and explanation for this question are in NEET MIND Premium.
Question 47 (NEET 2021, Q146)
Molecular Basis of InheritanceBotanyMedium
Identify the correct statement.
1. Option A: Split gene arrangement is characteristic of prokaryotes
2. Option B: In capping, methyl guanosine triphosphate is added to the 3' end of hnRNA
3. Option C: RNA polymerase binds with Rho factor to terminate the process of transcription in bacteria
4. Option D: The coding strand in a transcription unit is copied to an mRNA
The answer and explanation for this question are in NEET MIND Premium.
Question 48 (NEET 2021, Q147)
Structural Organisation in AnimalsBotanyMedium
Match Column-I with Column-II.
1. Option A: (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
2. Option B: (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. Option C: (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. Option D: (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
The answer and explanation for this question are in NEET MIND Premium.
Question 49 (NEET 2021, Q149)
Cell Cycle and Cell DivisionBotanyEasy
Match List-I with List-II. Choose the correct answer from the options given below.Match List-I with List-II. Choose the correct answer from the options given below.
1. Option A: (1) (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
2. Option B: (2) (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
3. Option C: (3) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
4. Option D: (4) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
Show answer & explanationHide answer & explanation
Correct answer: (D) (4) (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
Explanation
Correct matching: - **S phase** → **DNA replication (iv)** - **G₂ phase** → **Proteins are synthesized (i)** - **Quiescent stage (G₀ phase)** → **Inactive phase (ii)** - **G₁ phase** → **Interval between mitosis and initiation of DNA replication (iii)** Therefore, the correct option is **(4)**.
Question 50 (NEET 2021, Q150)
Molecular Basis of InheritanceBotanyMedium
Nowadays it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complementary DNA in a clone of cells, followed by its detection using autoradiography. The mutated gene is detected because:
1. Option A: Mutated gene does not appear on photographic film as the probe has complementarity with it
2. Option B: Mutated gene partially appears on a photographic film
3. Option C: Mutated gene completely and clearly appears on a photographic film
4. Option D: Mutated gene does not appear on a photographic film as the probe has no complementarity with it
The answer and explanation for this question are in NEET MIND Premium.
Question 51 (NEET 2021, Q151)
Chemical Coordination and IntegrationZoologyEasy
Erythropoietin hormone which stimulates R.B.C. formation is produced by:
1. Option A: Juxtaglomerular cells of the kidney
2. Option B: Alpha cells of pancreas
3. Option C: The cells of rostral adenohypophysis
4. Option D: The cells of bone marrow
Show answer & explanationHide answer & explanation
Correct answer: (A) Juxtaglomerular cells of the kidney
Explanation
Juxtaglomerular cells of kidney produce erythropoietin, which stimulates RBC formation.
Question 52 (NEET 2021, Q152)
Structural Organisation in AnimalsZoologyMedium
Which of the following characteristics is incorrect with respect to cockroach?
1. Option A: 10th abdominal segment in both sexes bears a pair of anal cerci
2. Option B: A ring of gastric caeca is present at the junction of midgut and hindgut
3. Option C: Hypopharynx lies within the cavity enclosed by mouthparts
4. Option D: In females, 7th–9th sterna together form a genital pouch
The answer and explanation for this question are in NEET MIND Premium.
Question 53 (NEET 2021, Q153)
Body Fluids and CirculationZoologyEasy
Succus entericus is referred to as:
1. Option A: Chyme
2. Option B: Pancreatic juice
3. Option C: Intestinal juice
4. Option D: Gastric juice
The answer and explanation for this question are in NEET MIND Premium.
Question 54 (NEET 2021, Q154)
Cell Cycle and Cell DivisionZoologyMedium
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?
1. Option A: Pachytene
2. Option B: Leptotene
3. Option C: Zygotene
4. Option D: Diakinesis
Show answer & explanationHide answer & explanation
Correct answer: (D) Diakinesis
Explanation
Terminalisation of chiasmata occurs during diakinesis of meiotic prophase I.
Question 55 (NEET 2021, Q155)
Breathing and Exchange of GasesZoologyMedium
The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are:
1. Option A: pO₂ = 159 and pCO₂ = 0.3
2. Option B: pO₂ = 104 and pCO₂ = 40
3. Option C: pO₂ = 40 and pCO₂ = 45
4. Option D: pO₂ = 95 and pCO₂ = 40
Show answer & explanationHide answer & explanation
Correct answer: (B) pO₂ = 104 and pCO₂ = 40
Explanation
At alveoli, partial pressures are approximately pO₂ = 104 mm Hg and pCO₂ = 40 mm Hg.
Question 56 (NEET 2021, Q156)
The Living WorldZoologyEasy
Match the following: Choose the correct answer from the options given below.Match the following: Choose the correct answer from the options given below.
1. Option A: (1) (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
2. Option B: (2) (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
3. Option C: (3) (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
4. Option D: (4) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
The answer and explanation for this question are in NEET MIND Premium.
Question 57 (NEET 2021, Q157)
Biotechnology: Principles and ProcessesZoologyMedium
During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first?
1. Option A: Ligation
2. Option B: Annealing
3. Option C: Extension
4. Option D: Denaturation
The answer and explanation for this question are in NEET MIND Premium.
Question 58 (NEET 2021, Q158)
Microbes in Human WelfareZoologyEasy
Match List-I with List-II: Choose the correct answer from the options given below.
1. Option A: (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
2. Option B: (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
3. Option C: (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. Option D: (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
Show answer & explanationHide answer & explanation
Correct answer: (B) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
Explanation
Industrial microorganisms are used for the commercial production of various organic acids: - $\textit{Aspergillus niger}$ \rightarrow Citric acid - $\textit{Acetobacter aceti}$ \rightarrow Acetic acid - $\textit{Clostridium butylicum}$ \rightarrow Butyric acid - $\textit{Lactobacillus}$ \rightarrow Lactic acid Therefore, the correct matching is: $(a) \rightarrow (iii), \quad (b) \rightarrow (i), \quad (c) \rightarrow (iv), \quad (d) \rightarrow (ii)$ Hence, option **(2) / B** is correct.
Question 59 (NEET 2021, Q159)
Structural Organisation in AnimalsZoologyMedium
Which of the following statements wrongly represents the nature of smooth muscle?
1. Option A: These muscles are present in the wall of blood vessels
2. Option B: These muscles have no striations
3. Option C: They are involuntary muscles
4. Option D: Communication among the cells is performed by intercalated discs
The answer and explanation for this question are in NEET MIND Premium.
Question 60 (NEET 2021, Q160)
Locomotion and MovementZoologyEasy
Chronic autoimmune disorder affecting neuromuscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called:
1. Option A: Gout
2. Option B: Arthritis
3. Option C: Muscular dystrophy
4. Option D: Myasthenia gravis
Show answer & explanationHide answer & explanation
Correct answer: (D) Myasthenia gravis
Explanation
Myasthenia gravis is an autoimmune disorder affecting neuromuscular junctions, causing fatigue, weakness and paralysis of skeletal muscles.
Question 61 (NEET 2021, Q161)
Body Fluids and CirculationZoologyEasy
Persons with 'AB' blood group are called as 'Universal recipients'. This is due to:
1. Option A: Absence of antibodies, anti-A and anti-B, in plasma
2. Option B: Absence of antigens A and B on the surface of RBCs
3. Option C: Absence of antigens A and B in plasma
4. Option D: Presence of antibodies, anti-A and anti-B, on RBCs
The answer and explanation for this question are in NEET MIND Premium.
Question 62 (NEET 2021, Q162)
Cell Cycle and Cell DivisionZoologyMedium
The fruit fly has 8 chromosomes (2n) in each cell. During interphase of mitosis if the number of chromosomes at G₁ phase is 8, what would be the number of chromosomes after S phase?
1. Option A: 32
2. Option B: 8
3. Option C: 16
4. Option D: 4
The answer and explanation for this question are in NEET MIND Premium.
Question 63 (NEET 2021, Q163)
Human ReproductionZoologyMedium
Receptors for sperm binding in mammals are present on:
1. Option A: Zona pellucida
2. Option B: Corona radiata
3. Option C: Vitelline membrane
4. Option D: Perivitelline space
The answer and explanation for this question are in NEET MIND Premium.
Question 64 (NEET 2021, Q164)
The Living WorldZoologyEasy
Which one of the following belongs to the family Muscidae?
1. Option A: House fly
2. Option B: Fire fly
3. Option C: Grasshopper
4. Option D: Cockroach
The answer and explanation for this question are in NEET MIND Premium.
Question 65 (NEET 2021, Q165)
Biotechnology and Its ApplicationsZoologyMedium
Identify the incorrect pair:
1. Option A: Drugs — Ricin
2. Option B: Alkaloids — Codeine
3. Option C: Toxin — Abrin
4. Option D: Lectins — Concanavalin A
The answer and explanation for this question are in NEET MIND Premium.
Question 66 (NEET 2021, Q166)
Reproductive HealthZoologyMedium
Venereal diseases can spread through:(a) Using sterile needles (b) Transfusion of blood from infected person (c) Infected mother to foetus (d) Kissing (e) Inheritance Choose the correct answer.
1. Option A: (a) and (c) only
2. Option B: (a), (b) and (c) only
3. Option C: (b), (c) and (d) only
4. Option D: (b) and (c) only
Show answer & explanationHide answer & explanation
Correct answer: (D) (b) and (c) only
Explanation
Venereal diseases spread through infected blood transfusion and infected mother to foetus. They are not inherited and generally not transmitted through kissing. Sterile needles do not transmit infection.
Question 67 (NEET 2021, Q167)
Cell: The Unit of LifeZoologyMedium
The organelles that are included in the endomembrane system are:
1. Option A: Golgi complex, Endoplasmic reticulum, Mitochondria and Lysosomes
2. Option B: Endoplasmic reticulum, Mitochondria, Ribosomes and Lysosomes
3. Option C: Endoplasmic reticulum, Golgi complex, Lysosomes and Vacuoles
4. Option D: Golgi complex, Mitochondria, Ribosomes and Lysosomes
The answer and explanation for this question are in NEET MIND Premium.
Question 68 (NEET 2021, Q168)
Biotechnology and Its ApplicationsZoologyMedium
For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection? (1) Hybridization Technique (2) Western Blotting Technique (3) Southern Blotting Technique (4) ELISA Technique
1. Option A: Hybridization Technique
2. Option B: Western Blotting Technique
3. Option C: Southern Blotting Technique
4. Option D: ELISA Technique
The answer and explanation for this question are in NEET MIND Premium.
Question 69 (NEET 2021, Q169)
Biotechnology and Its ApplicationsZoologyHard
With regard to insulin choose correct options. (a) C-peptide is not present in mature insulin. (b) The insulin produced by rDNA technology has C-peptide. (c) The pro-insulin has C-peptide. (d) A-peptide and B-peptide of insulin are interconnected by disulphide bridges. Choose the correct answer.
1. Option A: (a) and (d) only
2. Option B: (b) and (d) only
3. Option C: (b) and (c) only
4. Option D: (a), (c) and (d) only
The answer and explanation for this question are in NEET MIND Premium.
Question 70 (NEET 2021, Q170)
Biotechnology: Principles and ProcessesZoologyMedium
A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is:
1. Option A: Poly(A) tail sequences
2. Option B: Degenerate primer sequence
3. Option C: Okazaki sequences
4. Option D: Palindromic nucleotide sequences
The answer and explanation for this question are in NEET MIND Premium.
Question 71 (NEET 2021, Q171)
Molecular Basis of InheritanceZoologyMedium
Which is the 'Only enzyme' that has capability to catalyse initiation, elongation and termination in the process of transcription in prokaryotes?
1. Option A: DNase
2. Option B: DNA dependent DNA polymerase
3. Option C: DNA dependent RNA polymerase
4. Option D: DNA Ligase
The answer and explanation for this question are in NEET MIND Premium.
Question 72 (NEET 2021, Q172)
The Living WorldZoologyMedium
Which one of the following organisms bears hollow and pneumatic long bones?
1. Option A: Ornithorhynchus
2. Option B: Neophron
3. Option C: Hemidactylus
4. Option D: Macropus
The answer and explanation for this question are in NEET MIND Premium.
Question 73 (NEET 2021, Q173)
The Living WorldZoologyHard
Read the following statements: (a) Metagenesis is observed in Helminths. (b) Echinoderms are triploblastic and coelomate animals. (c) Round worms have organ-system level of body organization. (d) Comb plates present in ctenophores help in digestion. (e) Water vascular system is characteristic of Echinoderms. Choose the correct answer from the options given below.
1. Option A: (b), (c) and (e) are correct
2. Option B: (c), (d) and (e) are correct
3. Option C: (a), (b) and (c) are correct
4. Option D: (a), (d) and (e) are correct
The answer and explanation for this question are in NEET MIND Premium.
Question 74 (NEET 2021, Q174)
Reproductive HealthZoologyEasy
Match List-I with List-II. Choose the correct answer from the options given below.
1. Option A: (a) → (iii), (b) → (i), (c) → (iv), (d) → (ii)
2. Option B: (a) → (iv), (b) → (ii), (c) → (i), (d) → (iii)
3. Option C: (a) → (i), (b) → (iii), (c) → (ii), (d) → (iv)
4. Option D: (a) → (ii), (b) → (iv), (c) → (iii), (d) → (i)
Show answer & explanationHide answer & explanation
Correct answer: (C) (a) → (i), (b) → (iii), (c) → (ii), (d) → (iv)
Explanation
Correct matching: - **Vaults** → **(i)** Entry of sperm through cervix is blocked. - **IUDs** → **(iii)** They increase phagocytosis of sperms within the uterus. - **Vasectomy** → **(ii)** It involves removal/cutting of vas deferens. - **Tubectomy** → **(iv)** It involves removal/cutting of fallopian tubes. Therefore, the correct option is **(3) / C**.
Question 75 (NEET 2021, Q175)
Body Fluids and CirculationZoologyEasy
Sphincter of Oddi is present at:
1. Option A: Junction of jejunum and duodenum
2. Option B: Ileo-caecal junction
3. Option C: Junction of hepato-pancreatic duct and duodenum
4. Option D: Gastro-oesophageal junction
The answer and explanation for this question are in NEET MIND Premium.
Question 76 (NEET 2021, Q176)
Molecular Basis of InheritanceZoologyMedium
If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?
1. Option A: T: 20; G: 25; C: 25
2. Option B: T: 20; G: 30; C: 20
3. Option C: T: 20; G: 20; C: 30
4. Option D: T: 30; G: 20; C: 20
The answer and explanation for this question are in NEET MIND Premium.
Question 77 (NEET 2021, Q177)
The Living WorldZoologyEasy
Match List-I with List-II. Choose the correct answer from the options given below.
1. Option A: (a) → (iv), (b) → (i), (c) → (ii), (d) → (iii)
2. Option B: (a) → (iv), (b) → (iii), (c) → (i), (d) → (ii)
3. Option C: (a) → (iii), (b) → (iv), (c) → (i), (d) → (ii)
4. Option D: (a) → (iii), (b) → (iv), (c) → (ii), (d) → (i)
The answer and explanation for this question are in NEET MIND Premium.
Question 78 (NEET 2021, Q178)
Body Fluids and CirculationZoologyMedium
Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?
1. Option A: Thrombokinase
2. Option B: Thrombin
3. Option C: Renin
4. Option D: Epinephrine
The answer and explanation for this question are in NEET MIND Premium.
Question 79 (NEET 2021, Q179)
Microbes in Human WelfareZoologyEasy
Which of the following is not an objective of biofortification in crops?
1. Option A: Improve micronutrient and mineral content
2. Option B: Improve protein content
3. Option C: Improve resistance to diseases
4. Option D: Improve vitamin content
Show answer & explanationHide answer & explanation
Correct answer: (C) Improve resistance to diseases
Explanation
Biofortification aims to improve nutritional quality, including protein, vitamins and micronutrient/mineral content, but not disease resistance.
Question 80 (NEET 2021, Q180)
EcosystemZoologyEasy
Dobson units are used to measure thickness of:
1. Option A: Troposphere
2. Option B: CFCs
3. Option C: Stratosphere
4. Option D: Ozone
The answer and explanation for this question are in NEET MIND Premium.
Question 81 (NEET 2021, Q181)
Reproductive HealthZoologyMedium
Which one of the following is an example of Hormone releasing IUD?
1. Option A: Multiload 375
2. Option B: CuT
3. Option C: LNG 20
4. Option D: Cu 7
Show answer & explanationHide answer & explanation
Correct answer: (C) LNG 20
Explanation
LNG-20 is a hormone-releasing IUD. Multiload 375, CuT and Cu7 are copper-releasing IUDs.
Question 82 (NEET 2021, Q182)
Cell Cycle and Cell DivisionZoologyMedium
The centriole undergoes duplication during:
1. Option A: $G_2$ phase
2. Option B: S-phase
3. Option C: Prophase
4. Option D: Metaphase
The answer and explanation for this question are in NEET MIND Premium.
Question 83 (NEET 2021, Q183)
Principles of Inheritance and VariationZoologyEasy
Which of the following RNAs is not required for the synthesis of protein?
1. Option A: siRNA
2. Option B: mRNA
3. Option C: tRNA
4. Option D: rRNA
The answer and explanation for this question are in NEET MIND Premium.
Question 84 (NEET 2021, Q184)
Principles of Inheritance and VariationZoologyMedium
In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?
1. Option A: 100%
2. Option B: 50%
3. Option C: 75%
4. Option D: 25%
The answer and explanation for this question are in NEET MIND Premium.
Question 85 (NEET 2021, Q185)
Breathing and Exchange of GasesZoologyHard
Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.
1. Option A: Low pO₂, low pCO₂, more H⁺, higher temperature
2. Option B: High pO₂, low pCO₂, less H⁺, lower temperature
3. Option C: Low pO₂, high pCO₂, more H⁺, higher temperature
4. Option D: High pO₂, high pCO₂, less H⁺, higher temperature
Show answer & explanationHide answer & explanation
Correct answer: (B) High pO₂, low pCO₂, less H⁺, lower temperature
Explanation
Formation of oxyhaemoglobin in alveoli is favoured by high partial pressure of oxygen (pO₂), low pCO₂, lower H⁺ concentration and lower temperature.
Question 86 (NEET 2021, Q186)
EcosystemZoologyMedium
Match List-I with List-II: Choose the correct answer from the options given below.
1. Option A: (a) (iv), (b) (iii), (c) (ii), (d) (i)
2. Option B: (a) (iv), (b) (ii), (c) (iii), (d) (i)
3. Option C: (a) (iv), (b) (i), (c) (iii), (d) (ii)
4. Option D: (a) (iv), (b) (i), (c) (ii), (d) (iii)
The answer and explanation for this question are in NEET MIND Premium.
Question 87 (NEET 2021, Q187)
EvolutionZoologyEasy
Match List-I with List-II and choose the correct answer from the options given below:
1. Option A: (a) → (i), (b) → (iv), (c) → (iii), (d) → (ii)
2. Option B: (a) → (iv), (b) → (iii), (c) → (ii), (d) → (i)
3. Option C: (a) → (iii), (b) → (ii), (c) → (i), (d) → (iv)
4. Option D: (a) → (ii), (b) → (i), (c) → (iv), (d) → (iii)
Show answer & explanationHide answer & explanation
Correct answer: (B) (a) → (iv), (b) → (iii), (c) → (ii), (d) → (i)
Explanation
Correct matching: - **(a) Adaptive radiation → (iv) Darwin Finches** Darwin’s finches evolved from a common ancestor into different species adapted to different ecological niches. - **(b) Convergent evolution → (iii) Wings of Butterfly and Bird** These are analogous organs that perform similar functions but have different evolutionary origins. - **(c) Divergent evolution → (ii) Bones of forelimbs in Man and Whale** These are homologous organs derived from a common ancestor but modified for different functions. - **(d) Evolution by anthropogenic action → (i) Selection of resistant varieties due to excessive use of herbicides and pesticides** Human activities can drive evolution by selecting resistant organisms. Therefore, the correct option is **(2)**.
Question 88 (NEET 2021, Q188)
Human ReproductionZoologyMedium
Which of these is not an important component of initiation of parturition in humans?
1. Option A: Release of Prolactin
2. Option B: Increase in estrogen and progesterone ratio
3. Option C: Synthesis of prostaglandins
4. Option D: Release of Oxytocin
The answer and explanation for this question are in NEET MIND Premium.
Question 89 (NEET 2021, Q189)
Molecular Basis of InheritanceZoologyMedium
Which one of the following statements about Histones is wrong?
1. Option A: Histones carry positive charge in the side chain
2. Option B: Histones are organized to form a unit of 8 molecules
3. Option C: The pH of histones is slightly acidic
4. Option D: Histones are rich in amino acids - Lysine and Arginine
The answer and explanation for this question are in NEET MIND Premium.
Question 90 (NEET 2021, Q190)
Locomotion and MovementZoologyHard
During muscular contraction which of the following events occur? (a) 'H' zone disappears (b) 'A' band widens (c) 'I' band reduces in width (d) Myosin hydrolyzes ATP, releasing ADP and Pi (e) Z-lines attached to actins are pulled inwards Choose the correct answer from the options given below:
1. Option A: (1) (b), (d), (e), (a) only
2. Option B: (2) (a), (c), (d), (e) only
3. Option C: (3) (a), (b), (c), (d) only
4. Option D: (4) (b), (c), (d), (e) only
Show answer & explanationHide answer & explanation
Correct answer: (B) (2) (a), (c), (d), (e) only
Explanation
During muscle contraction, H-zone disappears, I-band shortens, ATP is hydrolysed by myosin ATPase, and Z-lines move inward. The A-band length remains constant and does not widen.
Question 91 (NEET 2021, Q191)
Locomotion and MovementZoologyEasy
Match List-I with List-II: Choose the correct answer from the options given below:
1. Option A: (a) iv, (b) iii, (c) ii, (d) i
2. Option B: (a) i, (b) iii, (c) ii, (d) iv
3. Option C: (a) ii, (b) iii, (c) iv, (d) i
4. Option D: (a) iv, (b) ii, (c) iii, (d) i
Show answer & explanationHide answer & explanation
Correct answer: (A) (a) iv, (b) iii, (c) ii, (d) i
Explanation
Correct matching: - Scapula $\rightarrow$ Triangular flat bone $(iv)$ - Cranium $\rightarrow$ Fibrous joints $(iii)$ - Sternum $\rightarrow$ Flat bone $(ii)$ - Vertebral column $\rightarrow$ Cartilaginous joints $(i)$ Thus, the correct option is **(1) / A**. This belongs to Class 11 Biology under *Locomotion and Movement*, which includes skeletal system and joints.
Question 92 (NEET 2021, Q192)
EcosystemZoologyMedium
Assertion (A): A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations. Reason (R): Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen. Choose the correct answer:
1. Option A: (A) is false but (R) is true
2. Option B: Both (A) and (R) are true and (R) is the correct explanation of (A)
3. Option C: Both (A) and (R) are true but (R) is not the correct explanation of (A)
4. Option D: (A) is true but (R) is false
The answer and explanation for this question are in NEET MIND Premium.
Question 93 (NEET 2021, Q193)
Body Fluids and CirculationZoologyMedium
The Adenosine deaminase deficiency results into:
1. Option A: Addison's disease
2. Option B: Dysfunction of immune system
3. Option C: Parkinson's disease
4. Option D: Digestive disorder
The answer and explanation for this question are in NEET MIND Premium.
Question 94 (NEET 2021, Q194)
Reproductive HealthZoologyMedium
Which of the following is not a step in Multiple Ovulation Embryo Transfer Technology (MOET)?
1. Option A: Fertilized eggs are transferred to surrogate mothers at 8–32 cell stage
2. Option B: Cow is administered hormone having LH-like activity for super ovulation
3. Option C: Cow yields about 6–8 eggs at a time
4. Option D: Cow is fertilized by artificial insemination
Show answer & explanationHide answer & explanation
Correct answer: (B) Cow is administered hormone having LH-like activity for super ovulation
Explanation
In MOET, cows are administered hormones with FSH-like activity for superovulation, not LH-like activity.
Question 95 (NEET 2021, Q195)
Human Health and DiseaseZoologyEasy
Match List-I with List-II Choose the correct answer from the options given below.
1. Option A: (1) (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
2. Option B: (2) (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
3. Option C: (3) (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
4. Option D: (4) (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
The answer and explanation for this question are in NEET MIND Premium.
Question 96 (NEET 2021, Q196)
BiomoleculesZoologyHard
Following are the statements with reference to lipids: (a) Lipids having only single bonds are called unsaturated fatty acids. (b) Lecithin is a phospholipid. (c) Trihydroxy propane is glycerol. (d) Palmitic acid has 20 carbon atoms including carboxyl carbon. Choose the correct answer from the options given below.
1. Option A: (1) (b) and (e) only
2. Option B: (2) (a) and (b) only
3. Option C: (3) (c) and (d) only
4. Option D: (4) (b) and (c) only
The answer and explanation for this question are in NEET MIND Premium.
Question 97 (NEET 2021, Q197)
Structural Organisation in AnimalsZoologyMedium
Following are the statements about prostomium of earthworm: (a) It serves as a covering for mouth. (b) It helps to open cracks in the soil into which it can crawl. (c) It is one of the sensory structures. (d) It is the first body segment. Choose the correct answer from the options given below.
1. Option A: (1) (b) and (c) are correct
2. Option B: (2) (a), (b) and (c) are correct
3. Option C: (3) (a), (b) and (d) are correct
4. Option D: (4) (a), (b), (c) and (d) are correct
The answer and explanation for this question are in NEET MIND Premium.
Question 98 (NEET 2021, Q198)
Human ReproductionZoologyMedium
Which of the following secretes the hormone relaxin, during the later phase of pregnancy?
1. Option A: Uterus
2. Option B: Graafian follicle
3. Option C: Corpus luteum
4. Option D: Foetus
The answer and explanation for this question are in NEET MIND Premium.
Question 99 (NEET 2021, Q199)
Molecular Basis of InheritanceZoologyEasy
Statement I: The codon 'AUG' codes for methionine and phenylalanine. Statement II: 'AAA' and 'AAG' both codons code for the amino acid lysine. In the light of the above statements, choose the correct answer from the options given below.
1. Option A: Statement I is incorrect but Statement II is true
2. Option B: Both Statement I and Statement II are true
3. Option C: Both Statement I and Statement II are false
4. Option D: Statement I is correct but Statement II is false
The answer and explanation for this question are in NEET MIND Premium.
Question 100 (NEET 2021, Q200)
Cell: The Unit of LifeZoologyMedium
Identify the types of cell junctions that help to stop leakage of substances across a tissue and facilitate communication with neighbouring cells via rapid transfer of ions and molecules.
1. Option A: Adhering junctions and Gap junctions, respectively
2. Option B: Gap junctions and Adhering junctions, respectively
3. Option C: Tight junctions and Gap junctions, respectively
4. Option D: Adhering junctions and Tight junctions, respectively
The answer and explanation for this question are in NEET MIND Premium.

Practise NEET 2021 Biology with your progress saved

A free account gives you 15 PYQs in every chapter with explanations, and keeps every mistake for revision.

Start practising free

NEET 2021 Biology Questions with Solutions

Chapter-wise: NEET 2021 Biology

All 100 NEET 2021 Biology questions

NEET Biology questions in other years

Practise NEET 2021 Biology with your progress saved