Question

Explain the process of double fertilisation in angiospermic plants 0

Answer 1

ta, mate !

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• fertilisation is the process of fusion of male and female gametes.
• for the fusion of male and female gametes pollengrains have to reach the pollen tubes....only one pollen tube finally reaches the embryosac.
• this tube will have two male nuclei,,,,,which migrate to the tip of the pollen tube at the time of fertilisation
• usually the pollen tube enters the ovule through micropyle and discharges the two male gametes into its embryosac
• one male nucleus {gamete} approaches the egg and fuses with it to form a diploid {2n} zygote
• this is called first fertilisation
• the other male nucleus {gamete} reaches the second nucleus {2n} and fuses with it to form endosperm nucleus which will be triploid....
• this is second fertilisation in the embryosac
• thus double fertilisation occurs in embryosac which is unique i flowerig plants.....

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