Where does the process of spermatogenesis take place?

Luteinising hormone $(LH)$ in females:

The termination of the process of oogenesis is indicated by the formation of . . . . . . .

After ovulation,the ruptured Graafian follicle transforms into which structure?

The schematic representation of spermatogenesis is given below. How many chromosomes do $P$,$Q$,and $R$ contain?
$P$ (Spermatogonia) $\rightarrow$ $Q$ (Primary Spermatocyte) $\rightarrow$ $R$ (Spermatid)

Which organelle is important for spermiogenesis and forms the acrosome?