The body shows sexual maturity when reaching puberty because of the various hormonal changes that happens in the body. There are several hormones that are produced during the time of reaching puberty, these hormones not only influence the sexual characters but they also influence the overall body mass build up. The function of all hormones is usually interconnected and they untorn influence the body. This is the major reason why there is a maturation that is seen in the body at the time of puberty.

Some of the learners also asked:
What do you mean by polar nuclei?