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A pollen grain contains the male gametophyte, which is __________.
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Male gametophyte produce male gametes.. that is two sperm cells which are haploid and they undergo fertilization to produce a diploid zygote and a triploid primary endosperm nucleus (PEN) that develops into endosperm.. Well,if it's from your book..then you have to read it to fill the blank.
It is 'haploid'.
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