Growth of pollen tube towards the embryo sac is:

Through which cell of the embryo sac does the pollen tube enter the embryo sac?

The entry of the pollen tube into the ovule through the micropyle is known as:

$A$: Filiform apparatus guides the pollen tube into the synergids.
$R$: It is a special cellular thickening at the micropylar tip to secrete chemotropic stimulus.

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.

After penetrating the stigmatic and stylar tissues,the pollen tube usually grows down towards the egg because: