(a) Mitosis:

It is important for:

•Increasing the number of cells in a particular tissue.

•Protection from harmful microorganism in case of a cut or wound.

•Replacing or repairing dead or inefficient cells in a tissue.

•To maintain the ratio of cytoplasm to nucleoplasm as well as surface area to volume.

(b) Meiosis:

•It is the most essential process in all sexually reproducing animals.

•Maintain chromosomal number in zygote (diploidity of zygote).

•Meiosis show crossing over, resulting in genetic recombination.

•Meiosis show a number of incidences of mutation (sudden changes in genetic material).