Double fertilization was first discovered by Nawaschin $(1898)$ in

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

In double fertilization,after entering ..... of the synergids,the pollen tube releases ..... male gametes into the cytoplasm of the synergids.

Fusion of egg and male gamete $- P$
Fusion of secondary nuclei and male gamete $- Q$
Select the correct option for $P$ and $Q$.
$\quad\quad P \quad\quad\quad Q$

In which of the following plants does double fertilization occur?

During double fertilization,the endosperm is formed by ........