There are two mechanisms whereby pollination occurs:
Animal pollination or insect pollination. Food or another reward is provided and "advertised" via color or fragrance. This mechanism can be effective in promoting pollination even in sparse populations.
Wind pollination requires dense populations.
Self-pollination (which would result in inbreeding) is frequently prevented in plants, even though they might have perfect flowers. Flowers may be imperfect, plants may be dioecious, or compatibility genes might be required for successful pollination to occur.
Once pollination occurs, the pollen coat ruptures and the pollen tube grows downward through the style to the ovary. Once it enters the embryo sac via the micropyle, the pollen nuclei migrate downward through the tube and double fertilization occurs.
Tags: Bio Technology, Bio Genetics, Pollination
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