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Zoology MCQs for NEET — Practice Questions with Answers

Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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NEET 2024
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Regarding catalytic cycle of an enzyme action, select the correct sequential steps:

A. Substrate enzyme complex formation. B. Free enzyme ready to bind with another substrate. C. Release of products. D. Chemical bonds of the substrate broken. E. Substrate binding to active site.

Choose the correct answer from the options given below:

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Explanation

Binding (E) → ES complex (A) → bond cleavage (D) → product release (C) → free enzyme (B).

NEET 2024
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As per ABO blood grouping system, the blood group of father is $B^+$, mother is $A^+$ and child is $O^+$. Their respective genotype can be:

A. $I^Bi\ /\ I^Ai\ /\ ii$ B. $I^BI^B\ /\ I^AI^A\ /\ ii$ C. $I^AI^B\ /\ ii\,I^A\ /\ I^B$ D. $I^Ai\ /\ I^Bi\ /\ I^Ai$ E. $iiI^B\ /\ iiI^A\ /\ I^Ai$

Choose the most appropriate answer from the options given below:

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Explanation

For child = $ii$, each parent must contribute one $i$. Father ($B$) must be $I^B i$; mother ($A$) must be $I^A i$ — only A satisfies this.

NEET 2025
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Polymerase chain reaction (PCR) amplifies DNA following the equation:

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Explanation

Each PCR cycle doubles the target DNA, so after $n$ cycles the number of copies is $2^n$ (exponential amplification).

NEET 2025
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What are the potential drawbacks in adoption of the IVF method? A. High fatality risk to mother B. Expensive instruments and reagents C. Husband/wife necessary for being donors D. Less adoption of orphans E. Not available in India F. Possibility that the early embryo does not survive Choose the correct answer:

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Explanation

Genuine drawbacks are the high cost (B), reduced adoption of orphans (D), and the chance that the early embryo fails to survive (F). IVF is available in India and donors need not be the couple.

NEET 2025
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What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog?

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Explanation

The venae cavae (precaval and postcaval) collect deoxygenated blood from the body and return it to the heart (via the sinus venosus) in the frog.

NEET 2025
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From the statements given below choose the correct option: A. The eukaryotic ribosomes are 80S and prokaryotic ribosomes are 70S. B. Each ribosome has two sub-units. C. The two sub-units of 80S ribosome are 60S and 40S while that of 70S are 50S and 30S. D. The two sub-units of 80S ribosome are 60S and 20S and that of 70S are 50S and 20S. E. The two sub-units of 80S are 60S and 30S and that of 70S are 50S and 30S. Choose the correct answer:

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Explanation

Eukaryotic = 80S (60S + 40S); prokaryotic = 70S (50S + 30S); every ribosome has two subunits. So A, B and C are true.

NEET 2025
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Match List - I with List - II:

List - I — A. Emphysema, B. Angina Pectoris, C. Glomerulonephritis, D. Tetany

List - II — I. Rapid spasms in muscle due to low Ca²⁺ in body fluid, II. Damaged alveolar walls and decreased respiratory surface, III. Acute chest pain when not enough oxygen is reaching to heart muscle, IV. Inflammation of glomeruli of kidney

Choose the correct answer:

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Explanation

Emphysema → damaged alveolar walls (II); Angina pectoris → chest pain from low O₂ to heart (III); Glomerulonephritis → inflammation of glomeruli (IV); Tetany → muscle spasms from low Ca²⁺ (I).

NEET 2025
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Which of the following statement is correct about location of the male frog copulatory pad?

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Explanation

The male frog has a copulatory (nuptial) pad on the first digit of each fore limb, used to grip the female during amplexus.

NEET 2025
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While trying to find out the characteristic of a newly found animal, a researcher did the histology of adult animal and observed a cavity with presence of mesodermal tissue towards the body wall but no mesodermal tissue was observed towards the alimentary canal. What could be the possible coelome of that animal?

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Explanation

When the body cavity is not lined by mesoderm on the gut side (mesoderm present only as scattered pouches towards the body wall), the animal is a pseudocoelomate.

NEET 2025
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Match List - I with List - II:

List - I — A. Head, B. Middle piece, C. Acrosome, D. Tail

List - II — I. Enzymes, II. Sperm motility, III. Energy, IV. Genetic material

Choose the correct answer:

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Explanation

Head → genetic material (IV); Middle piece (mitochondria) → energy (III); Acrosome → enzymes (I); Tail → sperm motility (II).

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