In over 60% of angiosperms,pollen grains are | vedclass

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(B) In angiosperms,the pollen grain represents the male gametophyte. During the development of the pollen grain,the microspore nucleus undergoes mitos

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$60\%, 40\%$

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(B) In angiosperms,the pollen grain represents the male gametophyte. During the development of the pollen grain,the microspore nucleus undergoes mitosis to form a vegetative cell and a generative cell. In about $60\%$ of angiosperms,pollen grains are shed at this $2$-celled stage. In the remaining species (less than $40\%$),the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed,resulting in a $3$-celled stage.

In over $60\%$ of angiosperms,pollen grains are shed at the $2$-celled stage. In less than $40\%$ of angiosperms,pollen grains are shed at the $3$-celled stage.

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