The movement of the pollen tube is..........

Mention the viability of pollen grains.

Pollen grains can be stored for years in ........

Mesogamy is the process in which:

In the diagram given below,show the path of a pollen tube from the pollen on the stigma into the embryo sac. Name the components of the egg apparatus.

How many of the following statements are true about the figure given below?
i. Germination of pollen grain.
ii. Motile male gametes.
iii. Two male gametes and one female gamete.
iv. Pollen grain without exine.
v. Tube nucleus at the tip of pollen tube.