Air class 7

Why is Air so important for human beings?

• Respiration

• Breathing

• For living and day to day activities

• All of above

Define Respiration?

Which of following are layers of air?

• Troposphere

• Mesosphere

• Exosphere

• Tropical

Oxygen is also called as _____.

In earlier days what was used for measuring of time?

• Shadows

• Sand

• Water

• Day and night

It's your time draw what you want! Hurray!!

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Nitrogen is much better for human beings to breathe

• True

• False