Chalazogamy is found in

If a plant bears only staminate flowers, what is it called?

Identify the type of flower $A$ and $B$ in the given diagram.

Select the correct option from the following statements regarding pollen grains:
$I -$ Pollen grains are rich in nutrients.
$II -$ In recent years,pollen tablets have been used as food supplements.
$III -$ In western countries,a large number of pollen products are available in the market in the form of tablets and syrups.
$IV -$ Pollen consumption has been claimed to increase the performance of athletes and racehorses.
$V -$ Pollen grains can germinate on the stigma after losing their viability.

Describe the post-fertilization changes in a flower.

Which one of the following is $NOT$ a disadvantage of self-pollination?