3. What are secondary sexual characters? Discuss each one of them.
4. Explain the menstrual cycle in human females.
Answers
Answer:
1)Increase in height:there is a sudden increase in height during adolescence,brought about by elongation of the bones of the arms and legs
2)Changes in body shape: in boys the shoulders become broad and the chest became wider.the muscles grow more than in girls.In girls the pelvic region widens,hips broaden,breasts develop and increase in size
3)Development of hair:in both male and female hair stars growing in armpits and in the pubic area. In boys facial hair develop
4)Voice changes:the larynx begins to grow.It becomes bigger in boys than in girls.so boys develop deep voice and girls have high pitched voice
5)Activity of sweat::There is an increased activity of sweat and sebaceous gland.this leads to increased sweating often resulting in body odour.
6)Changes in behaviour and attitudes: intellectual development occurs during adolescence to transform the individual from a child in to an adult
7)Sexual feelings: sexual maturity causes boys and girls to become interested in and attracted to opposite sex
The cycle of producing and releasing of mature egg or ova is called menstrual cycle.t he end of cycle sis accompanied by the breakdown of the lining of uterus that gets released in the form of blood and muscles through the vagina. it takes around 28 days to complete.the menstrual cycle starts at the age of 10-15 years(menarche) and the cycle stops at the age of 40-45 years(menopause)