(B) In angiosperms,the pollen grain at the time of shedding is usually at a two-celled stage,consisting of a vegetative cell and a generative cell. Th

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(B) In angiosperms,the pollen grain at the time of shedding is usually at a two-celled stage,consisting of a vegetative cell and a generative cell. The generative cell undergoes mitosis to produce two male gametes (male nuclei). Therefore,the generative cell is responsible for the formation of the two male nuclei.