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Answers
4a. The main function of the tail of the sperm is to help in the swimming towards the egg cell. (locomotory in function).
4b. The tip of sperm that is head of the sperm consists of genetic material i.e. DNA material and it also consists of enzymes which help in penetration of egg cell.
5. The reason why the frogs and fish lay eggs in such huge amounts is that many of those eggs get carried away by water and some are even destroyed by many animals.Yes,their population is very little when compared to the eggs they lay because only a few are capable of survival.
6. A baby has characters of both parents as the genes from both parents are transferred to the child.This happens because of DNA. From the 22 pairs of chromosomes half are transferred from mother and half from father . These characteristics or traits are called inherited traits because they came from our parents. This is the reason behind a child having both characteristics.