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

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

Worksheets For class 8

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

CLASS-8

BOARD: ICSE

BIOLOGY Worksheet - 8

TOPIC: Reaching The Age of Adolescence

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1. When an adolescent reaches reproductive maturity, _________ ends.

2. ____________ glands make the skin oilier.

3. Endocrine glands

(a) Do not possess ducts

(b) Sometime have duct

(c) Always have duct

(d) Pour their secretion though ducts

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

(a) Blood vascular system

(b) Nervous system

(c) Brain

(d) Nervous and endocrine system

5. Write notes on

(a) Adam’s apple

(b) Secondary sexual characters

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

7. Explain the role of hormone in your body.

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

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

10. ‘Adolescence is a crucial stage’. Justify this statement.

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

1. Puberty

2. Sebaceous

3. (a) Do not possess ducts

4. (d) Nervous and endocrine system

5. (a) At puberty, the voice box or the larynx begins to grow. Boys develop larger voice boxes. The growing voice box can be seen as a protruding part of the throat called Adam’s apple. It is absent in females

(b) Secondary sexual characters are those features that help to distinguish the male from the female. In girls, during puberty, breasts begin to develop & boys begin to grow facial hair that is moustaches & beard. As these features are used to distinguish male & female hence they are called secondary sexual characters.

6. 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.

7. Role of hormones:

Endocrine glands release hormones into the bloodstream to reach a particular body part called target site. The target sites respond to the hormones which play a very important role in the growth and development of our body. They maintain homeostasis in the body. Hormones are chemical messengers which are specific in action.

8. 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.

9.

10. Adolescence is the turning point of a person’s life. An individual attains full physical growth and a great amount of emotional stability. By this time, the values learnt during childhood & adolescence are grounded and a strong vision for future dominates. Stable relationships, intellectual & career pursuits & shouldering responsibities take priority. Hence, adolescence is a crucial stage.