In the process of pollination in angiosperms, the receptive part in the flower receives

Assertion $\left(\mathrm{A}\right)$: Pollen mother cells $\left(\mathrm{PMC}\right)$ are the first male gametophytic cells.

Reason $\left(\mathrm{R}\right):$ Each pollen mother cell $\left(\mathrm{PMC}\right)$ produces two pollen grain.

Which of the following statements are true about self pollination?

$\left(\mathrm{i}\right)$ Self pollination is the most economic method for plant modification.

$\left(\mathrm{ii}\right)$ Genetic stability can be maintained in the progeny through self pollination.

$\left(\mathrm{iii}\right)$ Undesirable characters can be eliminated through self pollination.

$\left(\mathrm{iv}\right)$ Continued self pollination may result in the less viable seeds.

$\left(\mathrm{v}\right)$ Self pollination favours evolution.