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BotanyNEET 2025Flower structure, microsporogenesis and megasporogenesis

Sexual Reproduction in Flowering Plants

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

Assertion (A): A typical unfertilised angiosperm embryo sac at maturity is 8-nucleate and 7-celled.

Reason (R): The egg apparatus has 2 polar nuclei.

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

  1. A.Both A and R are true and R is the correct explanation of A
  2. B.Both A and R are true but R is NOT the correct explanation of A
  3. C.A is true but R is false✓
  4. D.A is false but R is true

Solution

A mature embryo sac is 7-celled and 8-nucleate (A true) because the central cell carries two polar nuclei. The egg apparatus is the egg plus two synergids — the polar nuclei are not part of it, so R is false.

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