Question

Assertion :Only the pre-pollination growth of male gametophyte occurs inside the microsporangium whereas the remaining growth occurs over the female reproductive organs. Reason: Whole of the growth of female gametophyte occurs inside the megasporangium.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Pollen grain or microspore is the first cell of male gametophyte generation and represents immature male gametophyte. Development of male gametophyte is precocious, that is, it begins inside the microsporangium or pollen sac. The pollen grain is shed at 22 or 33 celled stage. The liberated pollen grains are transferred to the receptive surface of the carpel(i.e., stigma) through pollination. Remaining growth of the pollen grain occurs over the female reproductive organs. Female gametophyte or embryo sac is an oval multicellular haploid structure which is embedded in the nucellus towards micropylar end of the ovule (or integumented megasporangium). whole of the development of female gametophyte occurs inside the megasporangium.

So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.