Class 5 air and water support life

Air is a __________ resources.

• Artificial

• Natural

• Both of these

• None of these

What does this picture indicate?

• Layers of water

• Layers of air

• Layers of atmosphere

• None of the above

Air is a mixture of gases.

• True

• False

• May be

The atmosphere is ________ and __________ near the ground.

• Lighter, thicker

• Thicker, thinner

• Thinner, heavier

• Thicker , heavier

Atmosphere is divided into 4 layers.

• True

• False

• May be

After the atmosphere ends, ______begins.

• Air

• Space

• Both of these

• None of these

_______layer is the closest layer to the surface of the earth.

• Exosphere

• Stratosphere

• Troposphere

• None of the above

Meteoroids burns in _________ layer.

• Troposphere

• Thermosphere

• Mesosphere

• Exosphere

Why nitrogen is important?

• It is plant nutrient

• It neither burns nor support burning

• It helps the reduce the rate of burning

• It is needed by living things to breathe.

Carbon dioxide present in the air is used by __________

• Plants to prepare food

• Living organism to breathe

• Both of these

• None of these