Question

why fertilisation in an angiosperm referred to as double fertilisation?

Answer 1

Heya !!!

Here's your answer !!!

The fertilization in Angiosperms is referred to as Double fertilization as it involves two types of fusions namely Syngamy and Triple fusion...

Syngamy : One of the male gametes of the pollen grain moves towards the egg cell and the nucleus of the male gamete fuses with the nucleus of egg cell of embryosac ...This is called Syngamy or fertilization...

This results in formation of Diploid Zygote...


The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid Primary Endosperm Nucleus (PEN) ...As it involves the fusion of three haploid nuclei, it is termed as Triple fusion...

since, two types of fusions, Syngamy and Triple fusion take place in embryosac of Angiosperms , the phenomenon is thus called DOUBLE FERTILIZATION...


HOPE THIS HELPS YOU :)

PLEASE MARK AS BRAINLIEST

Answer 2

fertilisation in angiosperm is referred to as double fertilisation because two polar nuclei fuses two times ..
first with egg or ova
second with polar nuclei