Give reason-gametes have a haploid number of chromosomes.

Q. Give biological reasons for the following:
Gametes have haploids number of chromosome.

Q. i) Draw a well-labelled diagram to show the metaphase stage of mitosis in an animal cell having four chromosomes.
ii) Mention any two reasons for the population explosion in India.
iii) Give biological reasons for the following.
1) The pituitary gland is also known as the master gland.
2) Gametes have a haploid number of chromosomes.