Question

described the visible changes during puberty in boys and girld

Answer 1

visible changes in boys are:
1.) Hair grow on the face of boys and on chest.
2.) voice deepens in boys.It becomes low pitched and cracked voice.
3.) Testes and penis becomes larger.
4.) Chest and shoulders of boys broaden.
5.) Body becomes muscular.
6.) hair grow in armpits and in pubic region.
7.) Rapid increase in height occurs.

Visible changes in girls are:
1.) Breasts develope and enlarge in girls.
2.) Menstruation begins.
3.) Hips of girls broaden.
4.) Hair grow in Armpits and in pubic region.
5.) Rapid increase in height occurs.

Hope it helped..

Answer 2

SECONDARY SEXUAL CHARACTERS :

•   IN  BOYS  :-

1. the size of testes increase.
2. facial hair such as beard and mustache start to grow.
3. shoulders broaden.
4. muscle growth rate becomes high.
5. hair on hands and legs grow too.
6. the scrotum turns darker.
7. voice cracks  and becomes deeper.
8. testes start to make sperm cells.(spermato-genesis)              

•      IN GIRLS :-       

1. size of breasts enlarge.
2. the pubic area turns darker.
3. pelvis starts broadening.
4. hair grow in pubic region.
5. voice becomes shriller.
6. the menstrual cycle begins.
7. ovary start to release ovum (o-genesis)

all these are the characteristic changes which marks the onset of puberty (development).