Air Around Us

Plants, animals and human beings use oxygen for

• Respiration

• Living

• Eating

• Sleeping

The cycle of consumption and release of oxygen in nature is called ___________

• Carbon cycle

• Photosynthesis

• Oxygen cycle

• None

The atmosphere acts as a ________

• Air

• Blanket

• Water

• Shield

The hot air rises up and the_____ air takes its place

• Atmosphere

• Cool

• Carbon

• None

High up in the earth's atmosphere, in the region between about ___km and about ___km, is present a layer of ozone gas.

• 80,50

• 40, 90

• 25,78

• 10,50

The undesirable substances are called________

• Pollotants

• pollution

• pollutants

• pollutiontants

Which gas is produced by plants during respiration?

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

The ozone layer absorbs __-__% of the UV radiation from the sun.

• 45- 68

• 86-78

• 93-98

• 93-99

Plants respire only at night?

• True

• False

Layers of gas that prevents us from UV rays_____ _____

Write 1st letter in caps and the rest in small case