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class 8 science chapter 10 reaching the age of adolescence
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Answers
Answer:
5. During puberty you can expect a lot of changes to your body. Your genitals will get bigger.
In girls the breasts will grow and your vagina, uterus and fallopian tubes will develop.
In boys the penis and testes will get bigger. Boys will get erections more frequently.
Both boys and girls will get:
taller, heavier and stronger
an increase in sweating
more oily skin
hair growing around their genitals, under their arms and on their legs and arms.
The influx of hormones during puberty can cause a range of feelings or emotions in both young women and young men and these feelings can change often. You might get:
sudden mood changes
changing emotions
an involuntary increase in sexual feelings and fantasies.
Girls’ bodies increase in size and shape during puberty. Their hips become more rounded and they get a more defined waist. The vulva, vagina and nipples get bigger and the breasts begin to develop, sometimes unevenly.
Other changes include pubic hair appearing and a vaginal discharge - an increase in the mucous produced in the vagina.
Girls also start menstruating or having their period during this time.
6. the period following the onset of puberty during which a young person develops from a child into an adult.
7. Puberty is the time in life when a boy or girl becomes sexually mature. It is a process that usually happens between ages 10 and 14 for girls and ages 12 and 16 for boys. It causes physical changes, and affects boys and girls differently. In girls: The first sign of puberty is usually breast development.
8. The main factor that influences a person's height is their genetic makeup. However, many other factors can influence height during development, including nutrition, hormones, activity levels, and medical conditions. Scientists believe that genetic makeup, or DNA, is responsible for about 80% of a person's height.
9. Boys go through a growth spurt during puberty. However, the rates of growth can vary a lot because boys go through puberty at different ages. On average, boys tend to grow around 3 inches (or 7.6 centimeters) per year during this period.
10. (120/75) x 100 = 160 cm
So, the boy's height at the end of growth period will be 160 cm.
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Explanation:
5.List changes in the body that take place at puberty.
Answer:
The changes take place differently in the body of boys and girls at puberty. These change may be listed as below:
There is sudden increase in the height of both boys and girls. However, both reach their maximum height at the age of 17 to 18 years.
The voice of boys become hoarse and that of girls become shrill.
Shoulders become broader and muscles grow more prominently in boys. In girls, the regions below the waist becomes wider.
Hair start growing in different parts of boys and girls.
In most of the teenagers, due to increased secretion of sweat and sebaceous gland, get acne and pimples on their face.
Onset of puberty brings changes in secondary sexual characters in both male and female.
Boys and girls become capable of reproduction.
In girls, menstruation starts.
Different types of hormones start to release in initiating a reproductive function.
6.What is adolesence.
The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence.
7.What is puberty.
The period during which adolescent boys and girls reach sexual maturity and become capable of reproduction is called puberty. Puberty is a period of several years in which rapid physical growth occurs leading to sexual maturity.It tends to start earlier in girls than in boys.
8.Write the factors.......
Somatotropin (growth hormone) released from the anterior pituitary gland is responsible for an increase in growth (height and weight) of a person. It does so by helping build the bones and muscles.
9..What is the rate............
Once puberty hits, you may grow at a rate of 4 inches per year. However, everyone grows at a different pace. For girls, this growth spurt typically begins early in the teenage years. Boys may not experience this sudden increase in height until the end of their teens.
10.A boy..........
I can't calculate