Question

define double fertilisation. please in specific

Answer 1

Double fertilisation in plant.
It occurs inside each embryo sac. As the pollen tube enters the ovule it releases
two male gametes .The fusion of male
and female gamete in the embryo sac
to form zygote called syngamy . The other gamete fuses with polar nuclei. It is called triple fusion. The whole process ins called
Double fertilisation.

Answer 2

Double fertilization is a complex fertilization mechanism of flowering plants. This process involves the joining of a female gametophyte with two male gametes.