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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

NEET 2025

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Given below are two statements:

Statement I: The primary source of energy in an ecosystem is solar energy.

Statement II: The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).

In the light of the above statements, choose the most appropriate answer:

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

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Explanation

Statement I is correct. Statement II is wrong: the rate of production of organic matter during photosynthesis is gross primary productivity (GPP); NPP = GPP − respiratory loss.

NEET 2025

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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Both wind and water pollinated flowers are not very colourful and do not produce nectar.

Reason (R): The flowers produce enormous amount of pollen grains in wind and water pollinated flowers.

Choose the correct answer:

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 statements are true facts about abiotic pollination, but producing abundant pollen is not the reason flowers lack colour/nectar — so R does not explain A.

NEET 2025

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Which of the following is an example of non-distilled alcoholic beverage produced by yeast?

A. Whisky B. Brandy C. Beer D. Rum

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Explanation

Wine and beer are produced without distillation; whisky, brandy and rum are distilled beverages.

NEET 2025

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Given below are two statements:

Statement I: In a floral formula ⊕ stands for zygomorphic nature of the flower, and G̲ stands for inferior ovary.

Statement II: In a floral formula ⊕ stands for actinomorphic nature of the flower and G̲ stands for superior ovary.

In the light of the above statements, choose the correct answer:

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

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Explanation

The symbol ⊕ denotes actinomorphic (radial) symmetry and G̲ (line below G) denotes a superior ovary. Hence Statement II is correct and Statement I is incorrect.

NEET 2025

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Streptokinase produced by the bacterium Streptococcus is used for:

A. Curd production B. Ethanol production C. Liver disease treatment D. Removing clots from blood vessels

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Explanation

Streptokinase is a "clot buster" used to dissolve blood clots in patients with myocardial infarction.

NEET 2025

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Which chromosome in the human genome has the highest number of genes?

A. Chromosome X B. Chromosome Y C. Chromosome 1 D. Chromosome 10

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Explanation

Chromosome 1, the largest human chromosome, carries the maximum number of genes (~2968); the Y chromosome has the fewest.

NEET 2025

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Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?

A. Ethylene B. Abscisic acid C. Gibberellin D. Cytokinin

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Explanation

Cytokinins promote nutrient mobilisation towards leaves, thereby delaying their senescence (the "richmond–lang effect").

NEET 2025

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Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence. A. Prothallus stage B. Meiosis in spore mother cells C. Fertilisation D. Formation of archegonia and antheridia in gametophyte E. Transfer of antherozoids to the archegonia in presence of water. Choose the correct answer:

A. B, A, D, E, C B. B, A, E, C, D C. D, E, C, A, B D. E, D, C, B, A

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Explanation

Spore mother cells undergo meiosis (B) → spores germinate into the prothallus/gametophyte (A) → antheridia & archegonia form (D) → antherozoids reach archegonia in water (E) → fertilisation (C). Sequence B, A, D, E, C.

NEET 2025

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Which of the following organisms cannot fix nitrogen? A. Azotobacter, B. Oscillatoria, C. Anabaena, D. Volvox, E. Nostoc. Choose the correct answer:

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

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Explanation

Volvox is a colonial green alga and cannot fix nitrogen. Azotobacter, Oscillatoria, Anabaena and Nostoc are nitrogen-fixers.

NEET 2025

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Given below are two statements:

Statement I: Transfer RNAs and ribosomal RNA do not interact with mRNA.

Statement II: RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence.

In the light of the above statements, choose the most appropriate answer:

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Explanation

tRNA and rRNA do interact with mRNA during translation, so Statement I is incorrect. RNAi is a conserved cellular defence in eukaryotes, so Statement II is correct.

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