The phenomenon of syngamy (fertilization) in angiosperms was discovered by

Syngamy and triple fusion is called ... $A$ ... The central cell becomes ... $B$ ... develops into ... $C$ ... and zygote develops into ... $D$ ...
$A, B, C, D$ in the above statement are

Select the correct option regarding $PEN$.

The genotype of the endosperm is $ZZA$. Find out the genotype of the male and female plant,respectively.

Double fertilization is defined as ........

Double fertilization was discovered by . . . . . . .