How many meiotic divisions are required to produce $100$ functional megaspores in angiosperms?

Choose the correct option from the following statements.
$I$. During embryogenesis,the zygote undergoes mitotic cell division.
$II$. In organisms with a diplontic life cycle,the zygote divides by meiotic cell division.
$III$. The pericarp (fruit wall) develops from the ovary wall after fertilization.
$IV$. In brinjal,sepals remain attached to the fruit even after fertilization.

The number of meiotic divisions required to produce $40$ seeds in $Capsella$ is:

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.

In haploid organisms that undergo sexual reproduction,name the stage in the life cycle when meiosis occurs. Give reasons for your answer.

Dioecious plant $- P$
Monoecious plant $- Q$
Select the correct option for $P$ and $Q$.
$\quad\quad\quad P\quad\quad Q$