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Preview questions
1. What is the primary component of air?
Oxygen · Nitrogen · Carbon Dioxide · Hydrogen
2. Which gas is essential for the process of respiration?
Nitrogen · Oxygen · Argon · Carbon Dioxide
3. What percentage of the Earth's atmosphere is composed of nitrogen?
21% · 78% · 1% · 0.03%
4. Which layer of the atmosphere contains the ozone layer?
Troposphere · Stratosphere · Mesosphere · Thermosphere
5. What is the process by which plants release oxygen into the air?
Respiration · Photosynthesis · Transpiration · Evaporation
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