When male ejaculates sperms during coitus of which for normal fertility at least……. percent sperms must have normal shape and size and at least ………..per cent of them must show vigorous motility

Which is correct for oogenesis

In testis, the immature germ cells produce sperm by $…A…$ at puberty $…B…$ present on the inside wall of seminiferous tubules multiply by$ …C..$. division and increase their number. Identify $A$,$B$ and $C$ from the above statement

Define spermiogenesis and spermiation.

Which of the following groups of cell in the male gonad, represent haploid cells?