Majority of pollen grains are shed at

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(B) The protoplast of a pollen grain is initially uninucleate $(1-celled)$.However, at the time of dehiscence and liberation from the anther, it under

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$2-celled$ stage

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(B) The protoplast of a pollen grain is initially uninucleate $(1-celled)$.However, at the time of dehiscence and liberation from the anther, it undergoes mitosis to become $2-celled$ or $3-celled$.In the majority of angiosperms (about $60\%$), pollen grains are shed at the $2-celled$ stage, consisting of a vegetative cell and a generative cell.

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