Double fertilization is a characteristic of

The term $Xenia$ refers to the effect of foreign pollen on which of the following?

The ploidy level in an egg cell is . . . . . . and in the endosperm is . . . . . . .

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.

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

What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.