explain the process of double fertilisation in angiosperms.

list the changes each part of the fertilised ovule undergoes to develop into the seed.

Please follow the link below for complete answer on double fertilisation:

The fertilized ovule has following parts which undergo changes and develop into seeds:
Integument: Seed coat
Micropyle: The merging radical from the seed comes out from the micropyle
Nucellus: perisperm
Polar nuclei which undergo triple fusion: Endosperm
Zygote:  Embryo

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