SSC Worksheet for Chapter - 9 Reaching The Age of Adolescence Class 8

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Find SSC Worksheet for chapter-9 Reaching The Age of Adolescence class 8

CLASS-8

BOARD: SSC

BIOLOGY Worksheet -9

TOPIC: Reaching The Age of Adolescence

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

1. Calcitonin is produced by ___________ gland.

2. ________ hormones regulate the amount of sugar in blood.

3. Which of the following is not gland?

(a) Pancreas

(b) Adrenal

(c) Pituitary

(d) Kidney

4. The right meal for adolescents consists of

(a) chips, noodles, coke

(b) chapatti, dal, vegetables

(c) rice, noodles and burger

(d) vegetable cutlets, chips and lemon drink

5. Which hormone controls the blood pressure in emergency?

(a) Thyroxin

(b) Prolactin

(c) Insulin

(d) Adrenaline

6. Write the names of hormones secreted by pituitary?

7. What is the difference between hypothyroidism and hyperthyroidism?

8. Why personal hygiene is necessary for girls?

9. Expand AIDS? Write different methods of transmission of AIDS virus.

10. Write a note on sex determination in the unborn baby.

Solutions: to worksheet-9 Topic- Reaching The Age of Adolescence

1. Thyroid

2. Insulin

3. (d) Kidney

4. (b) chapatti, dal, vegetables

5. (d) Adrenaline

6. Growth hormone (GH) and Thyroid Stimulating Hormone (TSH) are the main hormones secreted by pituitary gland.

7.

Hypothyroidism	Hyperthyroidism
(a) It is the under production of thyroxine (b) It is characterized by low energy production slowing down of heart rate, loss of appetite and lethargy (c) Deficiency of thyroxine leads to a disease called Myxoedema	(a) It is the over production of thyroxine (b) It is characterized by increased energy production, increased heart beat, increased appetite, frequent sweating, shivering of hands (c) Over secretion of thyroxine causes exophthalmic goitre

8. At puberty, the sweat glands and sebaceous glands release more secretions making the body oily and sweaty. So taking a bath and cleaning all parts of the body is essential, otherwise, there archances of catching bacterial infections. During menstruation, girls suffer bleeding and hence its necessary for girls to maintain personal hygiene.

9. AIDS : Acquired Immunodeficiency Syndrome

Modes of transmission:

(a) By sharing the syringes used for injecting drug between normal and infected person.

(b) From infected mother to an infant through milk.

(c) Through sexual contact with a person infected with HIV.

10. Sex determination:

• Sex of an unborn baby is determined by a thread like structure called chromosomes, located inside the nucleus of zygote or fertilized egg.

• They carry information in the form of genes, which determine all inherited characters including sex of the baby.

• Each cell has 23 pairs of chromosomes, of which one pair is called sex chromosome. They are of two types ‘X’ and ‘Y’.

• Female cell contains two X chromosomes (XX) while male cells contain one X and one Y chromosome (XY).

• When the egg gets fertilized the sex of the child will depends on the kind of sperm that fertilizes the ovum.

• If the sperm carrying X chromosome fertilises the ovum, it would be a girl, since the chromosome pair will be XX.

• If the sperm carrying Y chromosome fertilises the egg, it would be a baby boy, since the chromosome pair will be XY.