NEETBotanySexual 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): In most angiosperms, the development of a mature female gametophyte from a megaspore mother cell requires exactly one meiotic and three mitotic divisions. Reason (R): The functional megaspore undergoes three successive mitotic divisions that are immediately followed by cell wall formation at each s
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (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
Correct answer
C. (A) is true but (R) is false
Step-by-step solution
Assertion (A) is true: The development of a mature female gametophyte (embryo sac) from a diploid megaspore mother cell involves one meiotic division (to form four haploid megaspores, out of which one is functional) and three successive mitotic divisions of the functional megaspore. Reason (R) is false: The mitotic divisions of the functional megaspore are strictly free-nuclear, meaning that nuclear divisions are not followed immediately by cell wall formation. It is only after the 8-nucleate stage is reached that