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NEET Practice Questions (MCQs) with Answers & Solutions

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

All Physics Chemistry Botany Zoology

NEET 2023

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Identify the correct statements:

A. Lenticels are the lens-shaped openings permitting the exchange of gases. B. Bark formed early in the season is called hard bark. C. Bark is a technical term that refers to all tissues exterior to vascular cambium. D. Bark refers to periderm and secondary phloem. E. Phellogen is single-layered in thickness.

A. B, C and E only B. A and D only C. A, B and D only D. B and C only

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Explanation

A and D correct. B wrong (early-season bark is SOFT). C wrong (bark is NON-technical per NCERT). E wrong (phellogen is a couple of layers thick).

NEET 2023

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Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of:

A. Succinic dehydrogenase B. Amylase C. Lipase D. Dinitrogenase

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Explanation

Malonate is a classic competitive inhibitor of succinic dehydrogenase (TCA cycle).

NEET 2023

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Match List I with List II:

List I	List II
A. Cohesion	I. More attraction in liquid phase
B. Adhesion	II. Mutual attraction among water molecules
C. Surface tension	III. Water loss in liquid phase
D. Guttation	IV. Attraction towards polar surfaces

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

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Explanation

A-II (cohesion = mutual attraction); B-IV (adhesion to polar); C-I; D-III (guttation = liquid water loss).

NEET 2023

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Match List I with List II:

List I	List II
A. Iron	I. Synthesis of auxin
B. Zinc	II. Component of nitrate reductase
C. Boron	III. Activator of catalase
D. Molybdenum	IV. Cell elongation and differentiation

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

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Explanation

Iron → catalase; Zinc → auxin; Boron → cell elongation; Mo → nitrate reductase.

NEET 2023

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Which of the following statements are correct about Klinefelter's Syndrome?

A. This disorder was first described by Langdon Down (1866). B. Such an individual has overall masculine development. However, the feminine development is also expressed. C. The affected individual is short statured. D. Physical, psychomotor and mental development is retarded. E. Such individuals are sterile.

A. A and B only B. C and D only C. B and E only D. A and E only

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Explanation

B and E correct. A wrong (Klinefelter described in 1942 by H. Klinefelter; Langdon Down → Down's syndrome). C wrong (Klinefelter individuals are typically tall, not short). D wrong (no severe mental retardation).

NEET 2023

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Which of the following combinations is required for chemiosmosis?

A. membrane, proton pump, proton gradient, ATP synthase B. membrane, proton pump, proton gradient, NADP synthase C. proton pump, electron gradient, ATP synthase D. proton pump, electron gradient, NADP synthase

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Explanation

Chemiosmosis needs a membrane, proton pump, proton gradient and ATP synthase.

NEET 2023

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How many different proteins does the ribosome consist of?

A. 80 B. 60 C. 40 D. 20

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Explanation

Eukaryotic 80S ribosome contains approximately 80 distinct proteins (NCERT figure).

NEET 2023

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A: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem. R: Internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves.

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

Both correct; condensed internodes give floral whorls instead of leaves at successive nodes.

NEET 2023

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A: In gymnosperms the pollen grains are released from the microsporangium and carried by air currents. R: Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.

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 is true (wind dispersal). R is false — gymnosperms DO form pollen tubes (siphonogamy).

NEET 2023

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Match List I (Interaction) with List II (Species A and B):

List I	List II
A. Mutualism	I. +(A), O(B)
B. Commensalism	II. -(A), O(B)
C. Amensalism	III. +(A), -(B)
D. Parasitism	IV. +(A), +(B)

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

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Explanation

Mutualism +/+; Commensalism +/0; Amensalism −/0; Parasitism +/−.

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