Unit 2: The Atmosphere - Gases in the Atmosphere

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1. Why has the percentage of hydrogen decreased from the early atmosphere to now?

  • It's escaped from the atompshere
  • It dissolved in oceans and rivers
  • It has been trapped underground
  • Human activity
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2. Which one of these processes increases carbon dioxide levels?

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

3. How does nitrogen support life?

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

4. Why do carbon dioxide levels rise at night?

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

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

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


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