Secondary sex characteristics are the physical features which distinguish male from female.
The Physical changes that occur is boys and girls during adolescence are:
Girls:
1. Height and weight increase.
2. Fatty and subcutaneous tissues develop.
3. Hip broadens.
4. Hair grows in arm pits and pubic area.
5. Voice becomes shrill.
6. Breast develops.
Boys
1. Height and weight increase.
2. Muscles develop.
3. Shoulder broadens.
4. Hair grows in the arm pits and pubic area, and facial hair also appears.
5. Voice break takes place due to lengthening of vocal cord and enlarging of larynx.
6. Size of the penis increases.
