Class 5 Earth Alive Breathe in Breathe Out

 A. Tick (the right answer.

1. We Breathe In....
(A) Nitrogen
(B) Oxygen

(C) Carbon Dioxide

2. When we run or do physical exercise, we breathe....

(a) normally
(b) faster
(c) slower

 

3. The is a muscular organ that pumps blood throughout the body.
(a) diaphragm

(b) lung
(c) heart

 

4. The lungs are protected by....
(a) ribcage
(b) diaphragm
(c) windpipe

 

5. When we breathe out air, it is called....

(a) inhalation

(b) exhalation

(c) blowing

B. Answer the following questions

1. What do you mean by the term breathing?

Breathing is the process of taking in oxygen-rich air and giving out carbon dioxide-rich air. It is a continuous process necessary for life.

2. Explain the process of exhalation.

Exhalation is the process of breathing out air. During exhalation, the diaphragm relaxes and moves upward, pushing the air out of the lungs through the windpipe and nose.

3. Differentiate between inhalation and exhalation.

Inhalation	Exhalation
It is the process of breathing in air.	It is the process of breathing out air.
The lungs expand.	The lungs contract.
The diaphragm moves downward.	The diaphragm moves upward.
Oxygen enters the body.	Carbon dioxide leaves the body.

4. Why should we breathe through the nose?

We should breathe through the nose because the tiny hairs inside the nose act as filters and prevent dust particles from entering the lungs.

5. Why does our breath form a mist on the mirror?

Our breath contains water vapour. When we breathe on a cool mirror, the water vapour condenses into tiny droplets, forming a mist.

 

C. Write ‘T’ for true and ‘F’ for false statements

1.   The ribs move forward when we breathe in. — T

2.   Lungs are located in the chest. — T

3.   The doctor uses a stethoscope to listen to our heartbeat. — T

4.   Air from our nose goes into the blood. — F

5.   The rate of breathing of an adult is about 16 times per minute. — T

6.   Oxygen is needed for burning. — T