Pollen grain

Pollen is a fine to coarse powder consisting of microgametophytes (pollen grains), which produce the male gametes (sperm cells) of seed plants. The pollen grain with its hard coat protects the sperm cells during the process of their movement between the stamens of the flower to the pistil of the next flower.
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The microspores of seed plants. It germinates to form the male gametophyte. The male gametophyte contains three haploid nuclei. One of these fertilizes the ovum, a second fuses with the two polar nuclei to form the triploid endosperm, and the third degenerates once double fertilization occurs.

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