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Botany MCQs for NEET — Practice Questions with Answers

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NEET 2024

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Match List I with List II.

List I	List II
A. Two or more alternative forms of a gene	I. Back cross
B. Cross of $F_1$ progeny with homozygous recessive parent	II. Ploidy
C. Cross of $F_1$ progeny with any of the parents	III. Allele
D. Number of chromosome sets in plant	IV. Test cross

Choose the correct answer from the options given below:

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

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Explanation

Allele, test cross, back cross, ploidy.

NEET 2024

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Identify the set of correct statements:

A. The flowers of Vallisneria are colourful and produce nectar.

B. The flowers of waterlily are not pollinated by water.

C. In most of water-pollinated species, the pollen grains are protected from wetting.

D. Pollen grains of some hydrophytes are long and ribbon like.

E. In some hydrophytes, the pollen grains are carried passively inside water.

Choose the correct answer from the options given below:

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

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Explanation

Vallisneria flowers are small, dull and do not produce nectar (A wrong). Waterlily is insect-pollinated despite being aquatic (B correct). C, D, E are standard NCERT facts.

NEET 2024

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Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of:

A. Enzyme activation B. Cofactor inhibition C. Feedback inhibition D. Competitive inhibition

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Explanation

Malonate, a substrate analogue of succinate, competes for the active site of succinate dehydrogenase.

NEET 2024

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List of endangered species was released by:

A. IUCN B. GEAC C. WWF D. FOAM

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Explanation

The IUCN Red List catalogues threatened species.

NEET 2024

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Given below are two statements:

Statement I: Bt toxins are insect group specific and coded by a gene cry IAc.

Statement II: Bt toxin exists as inactive protoxin in B. thuringiensis. However, after ingestion by the insect the inactive protoxin gets converted to active form due to acidic pH of the insect gut.

In the light of the above statements, choose the correct answer from the options given below:

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

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Explanation

Protoxin activation occurs in the alkaline pH of the insect midgut, not acidic — Statement II is false.

NEET 2024

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Lecithin, a small molecular weight organic compound found in living tissues, is an example of:

A. Carbohydrates B. Amino acids C. Phospholipids D. Glycerides

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Explanation

Lecithin (phosphatidylcholine) is a classic phospholipid.

NEET 2024

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Which of the following is an example of actinomorphic flower?

A. *Sesbania* B. *Datura* C. *Cassia* D. *Pisum*

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Explanation

Datura shows radial (actinomorphic) symmetry; the rest are zygomorphic.

NEET 2024

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Tropical regions show greatest level of species richness because:

A. Tropical latitudes have remained relatively undisturbed for millions of years, hence more time was available for species diversification.

B. Tropical environments are more seasonal.

C. More solar energy is available in tropics.

D. Constant environments promote niche specialization.

E. Tropical environments are constant and predictable.

Choose the correct answer from the options given below:

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

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Explanation

Tropics are LESS seasonal (B false). A, C, D, E are valid reasons given in NCERT.

NEET 2024

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Hind II always cuts DNA molecules at a particular point called recognition sequence and it consists of:

A. 10 bp B. 8 bp C. 6 bp D. 4 bp

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Explanation

Hind II recognition sequence is 6 bp (GTY↓RAC).

NEET 2024

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Bulliform cells are responsible for:

A. Providing large spaces for storage of sugars. B. Inward curling of leaves in monocots. C. Protecting the plant from salt stress. D. Increased photosynthesis in monocots.

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Explanation

Loss of turgor in bulliform cells causes leaves to roll inward, reducing transpiration.

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