what is penitration process in flower
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It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower. ... The tip of the pollen tube then enters the ovary and penetrates through the micropyle opening in the ovary. The pollen tube proceeds to release the two sperm in the megagametophyte.
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When pollen grains stick to stigma, pollen tube is formed which leads male gametes to eggs in which filliform apparatus plays a great role. Pollen tube *penitrates* into the synergids through micropylar end and one of the male gamete fuses with egg and another fuses with polar nuclei.
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