Unit 2: The Atmosphere - Gases in the Atmosphere

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1. Why do carbon dioxide levels rise at night?

  • Plants photosynthesise less
  • Plants don't photosynthesise
  • Humans breathe more
  • Increased burning of fossil fuels
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Other questions in this quiz

2. Why does the rate of photosynthesis increase in the summer?

  • Shorter day hours and decreased rainfall
  • Longer day hours and hotter weather
  • Longer day hours and increased rainfall
  • Shorter day hours and hotter weather

3. What percentage, on average, of the air is nitrogen?

  • 78%
  • 76%
  • 57%
  • 21%

4. What is the formula of methane?

  • CH4
  • CH
  • CH3
  • C4H4

5. Which one of these processes increases carbon dioxide levels?

  • Photosynthesis
  • Volcanic Activity
  • Dissolution in the oceans
  • Nitrogen Fixation

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