What would be the number of chromosomes in the meiocyte and gamete of an onion, respectively?

Transverse binary fission occurs in

Select the option that represents the organisms in descending order of their life span.

Identify the events $(A, B, D$ and $E)$ in the life cycle of sexual reproduction.

In $P$ type of plants,vegetative,reproductive,and senescent phases are clearly visible,whereas in $Q$ type of plants,it is difficult to clearly define these phases.
$\quad\quad\quad\quad P \quad\quad\quad\quad Q$
$(A)$ Annual $\quad$ Biennial,Perennial
$(B)$ Annual,Biennial $\quad$ Perennial
$(C)$ Perennial $\quad$ Annual,Biennial
$(D)$ Biennial,Perennial $\quad$ Annual

Organisms showing internal fertilisation show a reduction in the number of . . . . . . gametes and an increase in the number of . . . . . . gametes.