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NEET Practice Questions (MCQs) with Answers & Solutions

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NEET 2023

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Statement I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat. Statement II: When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.

A. Both Statement I and Statement II are true. B. Both Statement I and Statement II are false. C. Statement I is true but Statement II is false. D. Statement I is false but Statement II is true.

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Explanation

Standard NCERT facts; both true.

NEET 2023

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Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (N-terminal). Statement II: Adult human haemoglobin consists of 4 subunits (two subunits of α type and two subunits of β type).

A. Both Statement I and Statement II are true. B. Both Statement I and Statement II are false. C. Statement I is true but Statement II is false. D. Statement I is false but Statement II is true.

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Explanation

I wrong (left = N-terminal, right = C-terminal). II correct (HbA = α₂β₂).

NEET 2023

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A: Nephrons are of two types: Cortical & Juxta medullary, based on their relative position in cortex and medulla. R: Juxta medullary nephrons have short loop of Henle whereas cortical nephrons have longer loop of Henle.

A. Both A and R are true and R is the correct explanation of A. B. Both A and R are true but R is NOT the correct explanation of A. C. A is true but R is false. D. A is false but R is true.

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Explanation

A correct. R is reversed — juxtamedullary have LONG loop of Henle, cortical have short.

NEET 2023

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Match List I with List II:

List I	List II
A. Taenia	I. Nephridia
B. Paramoecium	II. Contractile vacuole
C. Periplaneta	III. Flame cells
D. Pheretima	IV. Urecose gland

A. A-I, B-II, C-III, D-IV B. A-I, B-II, C-IV, D-III C. A-III, B-II, C-IV, D-I D. A-II, B-I, C-IV, D-III

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Explanation

Taenia → flame cells; Paramecium → contractile vacuole; Cockroach → uricose gland; Earthworm → nephridia.

NEET 2023

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Match List I with List II:

List I	List II
A. Heroin	I. Effect on cardiovascular system
B. Marijuana	II. Slow down body function
C. Cocaine	III. Painkiller
D. Morphine	IV. Interfere with transport of dopamine

A. A-II, B-I, C-IV, D-III B. A-I, B-III, C-II, D-IV C. A-IV, B-III, C-II, D-I D. A-III, B-IV, C-I, D-II

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Explanation

Heroin slows; Marijuana affects CVS; Cocaine blocks dopamine reuptake; Morphine → analgesic.

NEET 2023

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Which of the following statements is correct?

A. Eutrophication refers to increase in domestic sewage and waste water in lakes. B. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. C. Presence of large amount of nutrients in water restricts 'Algal Bloom' D. Algal Bloom decreases fish mortality

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Explanation

Biomagnification: a toxicant becomes more concentrated up the food chain.

NEET 2023

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Match List I with List II:

List I (Cells)	List II (Secretion)
A. Peptic cells	I. Mucus
B. Goblet cells	II. Bile juice
C. Oxyntic cells	III. Proenzyme pepsinogen
D. Hepatic cells	IV. HCl and intrinsic factor for absorption of vitamin B₁₂

A. A-IV, B-III, C-II, D-I B. A-II, B-I, C-III, D-IV C. A-III, B-I, C-IV, D-II D. A-II, B-IV, C-I, D-III

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Explanation

Peptic → pepsinogen; Goblet → mucus; Oxyntic/parietal → HCl + IF; Hepatic → bile.

NEET 2023

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Statement I: Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct. Statement II: The cavity of the cervix is called cervical canal which along with vagina forms birth canal.

A. Both Statement I and Statement II are true. B. Both Statement I and Statement II are false. C. Statement I is correct but Statement II is false. D. Statement I incorrect but Statement II is true.

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Explanation

Both anatomical statements are accurate per NCERT.

NEET 2023

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Vital capacity of lung is _____.

A. IRV + ERV B. IRV + ERV + TV + RV C. IRV + ERV + TV − RV D. IRV + ERV + TV

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Explanation

VC = IRV + TV + ERV (max air expired after max inspiration).

NEET 2023

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Match List I with List II with respect to human eye:

List I	List II
A. Fovea	I. Visible coloured portion of eye that regulates diameter of pupil
B. Iris	II. External layer of eye formed of dense connective tissue
C. Blind spot	III. Point of greatest visual acuity or resolution
D. Sclera	IV. Point where optic nerve leaves the eyeball and photoreceptor cells are absent

A. A-III, B-I, C-IV, D-II B. A-IV, B-III, C-II, D-I C. A-I, B-IV, C-III, D-II D. A-II, B-I, C-III, D-IV

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Explanation

Fovea → acuity; Iris → pupil control; Blind spot → no photoreceptors; Sclera → outer dense CT.

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