Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?

Mitosis is the type of cell division which is required for growth and repair of body.
Mitosis is a type of equational division which can help in the generation of new cells and in their formation into the tissues which was destroyed at the site of injury in the body of the organism. In this case, if meiosis will take place, then it cannot supply more cells to the site of injury, thus resulting in the loss of blood and this will ultimately lead to the death of the organism.

Meiosis is the type of cell division which is involved in formation of gametes.
Meiosis is a type of reductional division which produces cell by reducing the number of chromosomes in them into half. In the gamete cell, if the gamete will contain full chromosomes due to mitosis, then at the time of fertilisation, when two gamete fuses (male gamete fuses with female gamete), then the chromosome number in the offspring will be doubled as compared to their parents, thus causing imbalance. But if each gamete will carry half the chromosomes, then the offspring will have the same number of chromosomes as that of their parents.