Question

Why is the process of fertilisation in angiosperms termed as double fertilisation explain

Answer 1

Your answer is as follow:-
During flowering plant reproduction, two structures are created: a zygoteand the endosperm. A zygote will grow and develop into an embryo, or baby plant. The endosperm is the plant embryo's food source. This process of forming a zygote and endosperm is called double fertilization, and it is unique to angiosperms.

Answer 2

Fertilisation in flowering plants is referred to as double fertilisation because both the male gametes of the same microspore take part in fusion. One fuses with the egg to form the diploid zygote, and the other fuses with the two polar nuclei (or secondary nuclei) to form the triploid primary endosperm nucleus.