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- 1. Multiple Choice
Plants, animals and human beings use oxygen for
Respiration
Living
Eating
Sleeping
- 2. Multiple Choice
The cycle of consumption and release of oxygen in nature is called ___________
Carbon cycle
Photosynthesis
Oxygen cycle
None
- 3. Multiple Choice
The atmosphere acts as a ________
Air
Blanket
Water
Shield
- 4. Multiple Choice
The hot air rises up and the_____ air takes its place
Atmosphere
Cool
Carbon
None
- 5. Multiple Choice
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
- 6. Multiple Choice
The undesirable substances are called________
Pollotants
pollution
pollutants
pollutiontants
- 7. Multiple Choice
Which gas is produced by plants during respiration?
Oxygen
Nitrogen
Carbon dioxide
Argon
- 8. Multiple Choice
The ozone layer absorbs __-__% of the UV radiation from the sun.
45- 68
86-78
93-98
93-99
- 9. Multiple Choice
Plants respire only at night?
True
False
- 10. Fill in the Blank
Layers of gas that prevents us from UV rays_____ _____
Write 1st letter in caps and the rest in small case
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