Question

Differentiate between the two cells enclosed in a mature male gametophyte of an angiosperm

Answer 1

There are three cells enclosed in the male gametophyte of angiosperms out of which two are male gametes and one is tube cell or vegetative cell. The two male gametes are small, round and surrounded by a little cytoplasm. They are situated towards the proximal part of the pollen tube, whereas the tube cell or vegetative cell is irregular in outline and is present in the distal part of the pollen tube. Two male gametes are functional and take part in double fertilization whereas the tube cell / vegetative degenerates after the growth of pollen tube.

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