Page 3 - K-2165 Evs 4C FINAL P58 LITE

B. Answer the following questions.

1. Breathing : It is a simple physical process that involves

gaseous exchange between the organism and the surroundings

of it.

2. Exhalation : When we breathe out air, the diaphragm relaxes

and moves up, pushing the air out from the lungs. This process

of breathing air out is called exhalation.
3. Inhalation
Exhalation

1. It is the process of taking 1. It is the process of breathe

in air in our body. out the air of our body.

2. In this process, lungs 2. In this process, lungs get

become large. squeezed.

3. In this process, dia- 3.I n this process, diaphragm

phragm moves down. moves up.

4. We should breathe through the nose because the nose has
hair that act as filters. They do not let dust particles enter our
lungs.

5. The air that we breathe out on a mirror will form mist because
that air is hot and the mirror surface is comparatively cool.
The water vapours present in hot air get condensed on the
cool surface of the mirror and hence form the mist.

C. Write ‘T’ for true and ‘F’ for false statements.
1. T 2. T 3. T 4. F 5. T 6. T
D. Fill in the blanks with appropriate words.
1. oxygen, carbon dioxide 2. diaphragm 3. fastly
4. blood 5. oxygen

E. Join the dots and complete the diagram. Also label it.

Nostrils Nasal passage
Bronchus Windpipe

Lungs Diaphragm

Creative Corner

A. Ask an elder to light a candle and fix it on a table. Cover
3 Nature First-5