CBSE Worksheet for Chapter - 8 Reaching The Age of Adolescence Class 8

Worksheets For class 8

Find CBSE Worksheet for chapter-8 Reaching The Age of Adolescence class 8

CLASS-8

BOARD: CBSE

BIOLOGY Worksheet - 8

TOPIC: Reaching The Age of Adolescence

For other CBSE Worksheet for class 8 Science check out main page of Physics Wallah.

 

 

1. _________ is absent in women’s neck.

2. _________ glands make the skin oilier.

3. Which of the following system exhibits body co-ordination?

(a) Blood vascular system

(b) Nervous system

(c) Brain

(d) Nervous and endocrine system

4. Which of the following flows directly into blood?

(a) Enzyme

(b) Hormone

(c) Minerals

(d) Proteins

5. Are there hormones in other animals also? Have they any role to play in reproduction?

6. What is the difference between puberty and adolescence?

7. List changes in the body that take place at puberty.

8. What are sex hormones? Why are they named so? State there function.

9. Many adolescents do not grow according to their age. Can you give reason, why?

10. Initially girls grow faster than boys but at 18 yrs of age, both reach their maximum height. Explain.

Solutions: to worksheet-8 Topic- Reaching The Age of Adolescence

1. Adam’s apple

2. Sebaceous

3. (d) Nervous and endocrine system

4. (b) Hormone

5. Hormones are secreted in other animals also to help in their growth and development. For example, metamorphosis in insects is controlled by insect hormones. In a frog, it is controlled by thyroxin, the hormone produced by thyroid. Thyroxin production requires the presence of iodine in water. If the water in which the tadpoles are growing does not contain sufficient iodine, the tadpoles cannot become adults.

6.

Puberty	Adolescence
(a) Puberty includes the physical changes in the body	(a) Adolescence includes both physical & psychological changes in the body
(b) Puberty is the start of the time when a boy is biologically ready to become a father & a girl is biologically ready to become a mother	(b) Adolescence is psychological & social transition from childhood to adulthood
(c) Puberty ends when an adolescent reaches reproductive maturity	(c) Adolescence may continue for few more years ever after the end of puberty.

7.

Physical changes in boys	Physical changes in girls
(a) The shoulders become broader	(a) The pelvic region widens
(b) The chest becomes wider	(b) Hips get broaden
(c) The body becomes more muscular	(c) Breasts develop & increase in size. The mammary glands develop inside the breasts
(d) Voice becomes deeper	(d) Start of menstrual cycle

8. The hormones which the responsible for secondary sexual characters in males & females are called sex hormones. Testosterone is the male sex hormone which brings about sexual maturity in males. Oestrogen is the female sex hormone which brings about sexual maturity in females. Hence they are called as sex hormones.

9. Many adolescents are at different stages of puberty, even though their age is same. The growth and   development of body depends upon the secretion of growth hormones which vary from person to person.

10. The rate of growth in height varies in different individuals. Same may grow suddenly at puberty & then slow down, while others may grow gradually. Hence, initially girls grow faster than boys but at 18 years of age, both reach their maximum height.