Answer:
Fertilisation in angiospermic flowering plants is known as double fertilisation because both the male gametes of a male gametophyte take parts in sexual fusion. One fuses with egg to give rise a diploid zygote while the other male gamete fuses with two polar nuclei (secondary diploid nucleus) to form the triploid primary endosperm nucleus (PEN). Thus, double fusion occurs in an embryo sac during fertilisation.
Double fertilisation results the formation of triploid endosperm which provide sufficient nutritional food to the developing embryo and seed. Endosperm helps in the production of healthy seeds. Thus, triploid endosperm compensates for the extreme reduced female gametophyte of angiosperms.
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