why does the vegetative cell degenerate after entering to tube
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Although I was unable to find any primary reference, there were many secondary references stating that the pollen tube does disintegrate. In very short, after the pollen tube reaches the female gametophyte, the pollen tube nucleus disintegrates. For the 'why', it disintegrates to let the two sperm cells pass through, and also since its function of controlling the growth of pollen tube has finished.
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because vegetative cell have to transfer male gametes to the embryo sac.
ishika2202:
generator cells produce the two male gametes not the vegetative cell
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