How many sperms are formed from a secondary spermatocyte?

Identify the cells represented as $\mathrm{P},\mathrm{Q},\mathrm{R}$ and $\mathrm{S}$ in the given schematic representation of spermatogenesis.

Identify the cells represented as $\mathrm{p},\mathrm{q},\mathrm{r}$ and $\mathrm{s}$ in the schematic representation of Oogenesis, shown below and choose the correct option.

If in a normal Menstruating woman, menses occur $5^{\mathrm{th}}$ April, what will be expected date of Ovulation?

Study the following

Among the above, correct combination are

Statement (S) : There is $\mathrm{LH}$ surge in Ovulatory phase.

Reason (R):  $\mathrm{LH}$ surge induces the growth and maturation of follicles in the Ovary.

The correct answer is

In the given diagram of human sperm, identify the functions of the labelled parts. $\mathrm{a}, \mathrm{b}$ and $\mathrm{c}.$