A: Formation of a mature male gametophyte req | vedclass

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(D) In $60\%$ of angiosperms,pollen grains are shed at the two-celled stage. The formation of a mature male gametophyte involves one meiotic division

Vedclass · Accepted Answer

Both Assertion and Reason are incorrect.

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(D) In $60\%$ of angiosperms,pollen grains are shed at the two-celled stage. The formation of a mature male gametophyte involves one meiotic division (to form microspores) and two mitotic divisions (one to form vegetative and generative cells,and another to divide the generative cell into two male gametes). Therefore,the Assertion is incorrect because it mentions only one mitotic division. The Reason is also incorrect because,in the majority of angiosperms,pollination occurs at the two-celled stage,not the three-celled stage. Thus,both statements are incorrect.

$A$: Formation of a mature male gametophyte requires one meiotic and two mitotic divisions in $60\%$ of angiosperms.
$R$: Pollination occurs in a two-celled condition in the majority of angiosperms.

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$A$: Formation of a mature male gametophyte requires one meiotic and two mitotic divisions in $60\%$ of angiosperms.$R$: Pollination occurs in a two-celled condition in the majority of angiosperms.