Other questions in this quiz

2. Why do carbon dioxide levels rise at night?

  • Plants photosynthesise less
  • Increased burning of fossil fuels
  • Plants don't photosynthesise
  • Humans breathe more

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

  • 78%
  • 76%
  • 57%
  • 21%

4. What is the formula of methane?

  • C4H4
  • CH4
  • CH3
  • CH

5. How does nitrogen support life?

  • Used in respiration
  • Used as nutrients for plants
  • Used in photosynthesis
  • Blocks harmful UV rays

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