When ripe pollen from anther(male organ) of the same kind of flower catches on the stigma(female organ), each pollen grain sends out a tiny threadlike tube. The tube grows down through the style and pierces on one of the ovules in the ovary.
Each ovule must receive the contents of the pollen tube before it can develop into a seed.
How long?
It usually take the tube around 2 to 5 days to reach the ovule, but the time may very from few hours to six months.
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