How many meiotic divisions are required to produce the pollen grains necessary for the formation of $800$ wheat seeds?

Which of the following are devices for self-pollination?

List the changes observed in an angiosperm flower subsequent to pollination and fertilisation.

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.

Match the following by using the codes provided:

$A$. Vernalization	$1$. Camerarius
$B$. Double fertilization	$2$. Hofmeister
$C$. Pollination	$3$. Lysenko
$D$. Alternation of Generations	$4$. Nawaschin

What does the product of sexual reproduction generally generate?