In flowering plants,the zygote is formed:

Double fertilization and triple fusion are characteristic features of . . . . . . .

Double fertilization is the fusion of:

Explain why sexual reproduction in angiosperms is said to take place through double fertilization and triple fusion? Also,provide a labelled diagram of the embryo sac to explain the phenomenon.

What is the ploidy of the Primary Endosperm Nucleus $(PEN)$ in angiosperms?

Which of the following features cannot be shown by the structure which is the vital link between two generations ensuring continuity of species?