What is most commonly observed in plants bearing bisexual flowers?

$A$: Growth of the male gametophyte is completed over the female reproductive organ.
$R$: The $2$-celled stage of the partial male gametophyte is developed in-situ.

Which one of the following operations with flowering plants would be most likely to produce the greatest number of variations in the offspring?

What is the chromosome number in a meiocyte of a potato?

Assertion $(A)$: Death is a meaningful event.
Reason $(R)$: Death limits the number of individuals of each species and returns the materials of the body,formed by life elements,back to the environment.

Choose the correct option with respect to the following structures:

Structure	Cellular structure	Flagella	Wall
$(a)$ Zoospore	Unicellular	Present	Absent
$(b)$ Conidia	Unicellular	Absent	Present
$(c)$ Gamete	Unicellular	Can be present	Can be present