What is the difference between cumulus oophorus and corona radiata?

Define the following:

Spermiogenesis.

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.

Choose the correct option to label the region $X$.

The process of formation of a mature female gamete is called oogenesis, which one amongst the following statements is incorrect?