In sexually reproducing organisms,the chromosome number is maintained by:

How many meiotic divisions are required to produce $32$ spermatozoa?

How many meiotic divisions are required to produce $28$ cells from a single cell?

The significance of meiosis lies in:

Which of the following statements are correct regarding the importance of meiosis?
$(i)$ It increases the genetic variability in the population of organisms from one generation to the next.
$(ii)$ It decreases genetic variability.
$(iii)$ It occurs in all cells of our body.
$(iv)$ It is an important process for evolution.

Which process is essential for maintaining a constant and specific number of chromosomes in organisms across generations?