When the fallopian tube is blocked at ampullary region, the ovum fails to move from

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

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?

Match the months listed in Column - I write the organogenesis of foetus in Column - II.