Selina solutions concise biology class 8 icse Solutions for Chapter 5 endocrine system and adolescence

Q1) Put a tick mark against the correct alternativ in the following statements :

(a) Cortisone hormone is secreted by :

1. Medulla of adrenal

2. Cortex of adrenal

3. Pancreas

4. Thyroid

(b) Which one of the following hormones converts excess of glucose into glycogen

1. Glucagon

2. Thyroxine

3. Insulin

4. Adrenaline

(c) Which one of the following hormones stimulates the breakdown of glycogen in the liver into glucose :

1. Insulin

2. Adrenaline

3. Glucagon

4. Thyroxine

(d) Which one of the following glands is also called the master gland :

1. Pituitary gland

2. Adrenal glandnd

3. Thyroid gland

4. Ovary

(e) The emergency hormone to face the danger or to fight is secreted by;

1. Islets of Langerhans

2. Adrenal cortex

3. Pituitary

4. Adrenal medulla

(f) Which one of the following endocrine glands produces its hormone in large quantities as a result of emotional stimulation;

1. Thyroid

2. Islets of Langerhans

3. Adrenal medulla

4. Adrenal cortex

(g) In humans, increased thyroxine production results in :

1. Increased metabolism

2. Decreased metabolism

3. Dwarfism

4. Cretinism

Q1)What is a hormone?

Q2) In Table given below, fill in the blanks by naming endocrine glands, the hormones they secrete, and the function they perform, in a normal person.

Q3) Match the items in Column A with those in Column B.

Q4) Name the source and the function of each of the following :

Q5) What is the difference between an exocrine gland and an endocrine gland ?

Q6) Why is Pituitary gland is called “master gland” ?

Q7) Briefly write about the importance of physical hygiene during adolescence.

Q8) Briefly discuss any four activities which can be practiced to overcome stress.