NEET Botany — MCQ Practice Questions & Answers

Question 1

Which of the following statements about pollen grains is INCORRECT?

Accepted Answer

Correct answer: C. Pollen grains are always unicellular — Mature pollen grains are bicellular (or sometimes tricellular), not unicellular. They contain vegetative and generative cells.

Answer

A. Each pollen grain contains two cells initially

Answer

B. Pollen wall consists of exine and intine

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D. Generative cell undergoes mitosis to form sperm cells

Question 2

In apomixis, seeds are produced without:

Accepted Answer

Correct answer: B. Meiosis and fertilization — Apomixis is asexual reproduction through seeds, occurring without meiosis and fertilization, producing clones of the parent.

Answer

A. Flower formation

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C. Fruit formation

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D. Seed coat development

Question 3

The phenomenon where a single plant produces both male and female flowers is called:

Accepted Answer

Correct answer: B. Monoecious — Monoecious plants have both male and female flowers on the same plant (e.g., maize, coconut). Dioecious plants have them on different plants.

Answer

A. Dioecious

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C. Hermaphrodite

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D. Polygamous

Question 4

Which stage of meiosis in microsporogenesis ensures genetic variation in pollen grains?

Accepted Answer

Correct answer: B. Anaphase I — Anaphase I involves separation of homologous chromosomes, which along with crossing over in Prophase I ensures genetic variation in resulting microspores.

Answer

A. Prophase I

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C. Telophase II

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D. Cytokinesis

Question 5

Identify the correct sequence in the development of male gametophyte:

Accepted Answer

Correct answer: B. Microsporocyte → Microspore → Pollen grain — The correct sequence is: Microsporocyte undergoes meiosis to form microspores, which undergo mitosis to form mature pollen grain (male gametophyte).

Answer

A. Microspore → Pollen grain → Pollen tube

Answer

C. Anther → Microspore → Generative cell

Answer

D. Meiosis → Mitosis → Gamete formation

Question 6

The endothecium in the anther wall is important for:

Accepted Answer

Correct answer: B. Dehiscence of anther — The endothecium contains fibrous thickenings on cell walls that help in anther dehiscence by creating tension during drying, aiding pollen dispersal.

Answer

A. Nutrition of pollen

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C. Protection from herbivores

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D. Secretion of fragrance

Question 7

The phenomenon where pollen grains retain viability after being kept in dry conditions for extended periods is called:

Accepted Answer

Correct answer: A. Pollen dormancy — Pollen dormancy refers to the reduced metabolic activity of pollen that allows it to maintain viability over extended storage periods in dry, cool conditions.

Answer

B. Pollen viability

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C. Pollen vitality

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D. Pollen preservation

Question 8

In a typical angiosperm flower, after dehiscence, the mature pollen is released at which stage?

Accepted Answer

Correct answer: B. Binucleate stage — Most angiosperms release pollen at the binucleate stage (containing generative and vegetative nuclei). Some release at the trinucleate stage after generative nucleus division.

Answer

A. Uninucleate stage

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C. Trinucleate stage

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D. Late tetrad stage

NEET Botany - MCQ Practice Questions