Fusion of two dissimilar gametes is called

Double fertilization was discovered by

The zygote is formed by which process?

What is formed when a male gamete fuses with the nucleus of the egg cell?

Primary endosperm nucleus is formed by the fusion of:

Differentiate between the following:
$(i)$ Red algae and brown algae
$(ii)$ Liverworts and moss
$(iii)$ Homosporous and heterosporous pteridophytes
$(iv)$ Syngamy and triple fusion