Match the following terms related to Gymnosperms/Angiosperms (as per standard botanical terminology) with their respective structures:

Column-$I$	Column-$II$
$P$. Pistil/Megasporophyll	$I$. Megasporophyll
$Q$. Ovule	$II$. Megasporangium
$R$. Embryo sac	$III$. Female gametophyte

The famous embryologist who advanced the science of embryology in India 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.

Is the presence of a large number of chromosomes in an organism a hindrance to sexual reproduction? Justify your answer by giving suitable reasons.

Which one of the following is an example of cleistogamy?

Identify the mismatch.