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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 2025
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Match List - I with List - II:

List - I — A. Heart, B. Kidney, C. Gastro-intestinal tract, D. Adrenal Cortex

List - II — I. Erythropoietin, II. Aldosterone, III. Atrial natriuretic factor, IV. Secretin

Choose the correct answer:

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Explanation

Heart → atrial natriuretic factor (III); Kidney → erythropoietin (I); GI tract → secretin (IV); Adrenal cortex → aldosterone (II).

NEET 2025
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The protein portion of an enzyme is called:

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Explanation

The protein part of a conjugate enzyme is the apoenzyme; apoenzyme + cofactor = holoenzyme.

NEET 2025
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Sweet potato and potato represent a certain type of evolution. Select the correct combination of terms to explain the evolution.

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Explanation

Sweet potato (modified root) and potato (modified stem) perform the same storage function from different origins — analogous structures arising by convergent evolution.

NEET 2025
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After maturation, in primary lymphoid organs, the lymphocytes migrate for interaction with antigens to secondary lymphoid organs/tissue(s) like: A. thymus B. bone marrow C. spleen D. lymph nodes E. Peyer's patches Choose the correct answer:

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Explanation

Spleen (C), lymph nodes (D) and Peyer's patches (E) are secondary lymphoid organs. Thymus and bone marrow are primary lymphoid organs.

NEET 2025
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Consider the following statements regarding function of adrenal medullary hormones: A. It causes pupilary constriction B. It is a hyperglycemic hormone C. It causes piloerection D. It increases strength of heart contraction Choose the correct answer:

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Explanation

Adrenaline/noradrenaline are hyperglycemic (B), cause piloerection (C) and increase the force of heart contraction (D). They cause pupillary dilation, not constriction, so A is wrong.

NEET 2025
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Why can't insulin be given orally to diabetic patients?

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Explanation

Insulin is a protein; if taken orally it would be digested by proteases in the GI tract, so it must be injected.

NEET 2025
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Which of the following hormones released from the pituitary is actually synthesized in the hypothalamus?

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Explanation

ADH (and oxytocin) are synthesised in the hypothalamus and merely stored/released from the posterior pituitary. LH, FSH and ACTH are made in the anterior pituitary.

NEET 2025
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Role of the water vascular system in Echinoderms is: A. Respiration and Locomotion B. Excretion and Locomotion C. Capture and transport of food D. Digestion and Respiration E. Digestion and Excretion Choose the correct answer:

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Explanation

In echinoderms the water vascular system helps in locomotion, capture & transport of food and respiration — so the correct pair from the options is A (respiration & locomotion) and C (capture & transport of food).

NEET 2025
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Which of the following type of immunity is present at the time of birth and is a non-specific type of defence in the human body?

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Explanation

Innate immunity is present from birth and provides non-specific defence (barriers, phagocytes, etc.).

NEET 2025
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In frog, the Renal portal system is a special venous connection that acts to link:

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Explanation

The renal portal system carries blood from the lower (posterior) part of the body to the kidneys before it returns to the heart.

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