what is pollen grains
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Pollen is a powdery substance consisting of pollen grains which are male microgametophytes of seed plants, which produce male gametes (sperm cells). ... The study of pollen is called palynology and is highly useful in paleoecology, paleontology, archaeology, and forensics.
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Each pollen grain is a single cell containing two male gametes. Once mature, the anther splits open and pollen is released. Both male gametes are involved in fertilisation, resulting in formation of a zygote and an endosperm. This process of double fertilisation is unique to flowering plants.
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