(B) In a majority of angiosperms $(> 60 \%)$,pollen grains are shed at the $2$-celled stage. These two cells consist of a larger vegetative cell and a

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(B) In a majority of angiosperms $(> 60 \%)$,pollen grains are shed at the $2$-celled stage. These two cells consist of a larger vegetative cell and a smaller generative cell. In the remaining species,the generative cell divides mitotically to form two male gametes before the pollen grains are shed,resulting in a $3$-celled stage.