IN THIS I DESCRIBE YOU ABOUT THE CHAPTER ADOLESCENE IN THE QUESTION ANSWER FORM TO MAKE IT EASIER FOR YOU GUYS TO REVISE , LEARN , SUMMARIZE YOUR CHAPTER FAST AND IN A EASY MANNER
Class 8th
Chapter 7
Reaching the age of Adolescence
1. What is adolescence?
The period of life, when the body undergoes changes, leading to reproductive maturity, is called
adolescence.
2. What is puberty?
The human body undergoes several changes during the period called puberty. Boys and boys
become capable of reproduction. Puberty ends when adolescent reaches reproductive maturity.
3. When does adolescence period begin?
Adolescence begins around the age of 11 and lasts up to 18 or 19 years of age.
Since this period also covers ‘teen’ years, adolescents are also called teenagers.
In girls, adolescence may begin a year or two earlier than boys.
The adolescence period varies from person to person.
4. What are the changes seen at puberty?
Increase in height.
Change in body shape.
Voice change.
Increased activity of sweat and sebaceous glands.
Development of sex organs.
Reaching mental, intellectual and emotional maturity.
5. Write the formula for calculation for full height in cms.
𝑝𝑟𝑒𝑠𝑒𝑛𝑡 ℎ𝑒𝑖𝑔ℎ𝑡 (𝑐𝑚)
× 100.
% 𝑜𝑓 𝑓𝑢𝑙𝑙 ℎ𝑒𝑖𝑔ℎ𝑡 𝑎𝑡 𝑡ℎ𝑖𝑠 𝑎𝑔𝑒
6. A boy is 9 years old and 120 cm tall. What is his height at the end of the growth period?
𝑝𝑟𝑒𝑠𝑒𝑛𝑡 ℎ𝑒𝑖𝑔ℎ𝑡 (𝑐𝑚)
× 100
% 𝑜𝑓 𝑓𝑢𝑙𝑙 ℎ𝑒𝑖𝑔ℎ𝑡 𝑎𝑡 𝑡ℎ𝑖𝑠 𝑎𝑔𝑒
120
× 100 = 160 𝑐𝑚 𝑡𝑎𝑙𝑙.
75
7. How does height increase at puberty?
In puberty, the arms bones and the legs bones elongate and make a person tall. Girls grow faster
than boys do. By 18 years, both reach their maximum height.
, 8. Why the height of an individual is more or similar to that of some family members?
The height is more or similar because height depends on the genes inherited from parents.
However, it is important to eat the right kind of food.
Food provides nutrients that help the bones, muscles and other parts to grow properly.
9. Why boys in senior class have broad shoulders and wider chests than in junior class?
This is because boys in senior class have reached puberty when shoulders broaden and chest
widens because of growth.
10. What are the changes in body shape in boys and girls during puberty?
In boys, muscles grow stronger than in the girls.
In boys, shoulders broaden and chest widens.
In girls, waist becomes wider.
11. Why does the voice of the boys cracks during puberty?
At puberty, the voice box or the larynx begins to grow.
Boys develop larger voice box.
It can be seen on the throat as Adam’s apple.
In girls, it is not visible because of smaller size.
Girls have high-pitched voice and boys have a deep voice.
12. Why do some boys have a hoarse (rough) voice?
In Adolescent boys, the muscles of the voice box go out of control and the voice becomes hoarse.
The voice becomes normal after few days or weeks.
13. What are endocrine or ductless glands? Give examples.
The glands that release the chemicals called hormones are called endocrine glands. For example
– thyroid gland, adrenal gland, pituitary gland, hypothalamus.
14. What are endocrine glands called ductless glands?
Endocrine glands are called ductless glands because they release hormones directly into the
bloodstream.
15. Why do people get acne and pimples on the face sometimes?
During puberty, sweat glands and sebaceous glands (oil glands) secrete sweat and oil rapidly.
People get acne and pimple because of the increased activity of these glands on the skin.
16. What are secondary sexual characters? Give examples.
The features that help to distinguish the male from the female are called secondary sexual
characters.
For example –
Boys begin to grow facial hairs.
In girls, breasts begin to develop at puberty.
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