Note down the secondary sexual changes that occur in girls and boy's during the puberty.

Explanation

The age at which the reproductive organs become functional and the boys and girls become sexually mature is know as .puberty.. The rate of general body growth begins to slow down, reproductive tissues begin to mature. This period during adolescence is called puberty.
Common changes occur during puberty: Following changes are common in boys and girls :
Thick hairs growing in armpits and the genital area between the thighs, thinner hair can also appear on legs and arms, as well as on face, increase in the height and weight, some times skin becomes oily and pimples may develop, etc.
Secondary sexual changes : In girls, ovary starts secreting female sex hormones.
`rarr` Ovaries start producing ova.
`rarr` Development of reproductive organs and breasts develop, with darkening of the skin of the nipples.
`rarr` Menstrual cycle starts.
`rarr` In Boys, testes start secreting male sex hormones.
`rarr` Testes start producing sperms. Many other changes take place during puberty.
New hair growth.
`rarr` Body becomes more muscular.
`rarr` The voice begin to crack.
`rarr` Shoulders and chest broaden.
The penis occasionaly begins to become enlarged and erect.