Class-5 Environmental Science Chapter-4 Breathing

 EVENTS CONVENT H.SCHOOL

03/02/2021             CLASS-5                   SLOT-2
Environmental science
Chapter-4 breathing

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 A.Answer the following Questions:-

Que.1 What is breathing?

Ans.1 Breathing is a natural process of taking in oxygen and giving out carbon dioxide.

 Que .2What happened when we breathe in and breathe out?

Ans.2 When we breathe in coma our lungs expand and when we breathe out, our lungs contract.

Ques.3 What happened to our breathing just after physical exercise? Why?

Ans.3 When we exercise or run, we breathe faster as we use more energy than be normally do.

 Que.4 Why do we see a fine mist of water droplets on the surface of mirror when we breathe out on to it?

Ans-4When we breathe out onto the surface of the mirror we find a fine mist of water droplets there this is because the water vapour in our warm breath has condensed on the mirror.

 Que.5 How does the hot liquid get Cooled by blowing on it?

 Ans.5 The hot and humid air just above the liquid is replaced by the air from over bridge, which is comparatively cooler. The movement of the air around the cup of liquid increases when we blow on it. Due to it heats caps more quickly from the surface of the tea making it cooler it is clear that our breath is cool in such situations.