Environmental facts and photosynthesis

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1. With sodium hydroxide sollution, to test the need for carbon dioxide in photosynthesis. Which experiment?

  • Removing carbon dioxide
  • Using oxygen and carbon dioxide sensors
  • Testing leaves for starch
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2. Which is not a factor affecting the rate of photosynthesis?

  • Level of carbon dioxide - they can only absorb so much carbon dioxide anyway
  • Temperature - does not affect photosynthesis, only the enzymes
  • Water - if there's enough water for the plant to survive there is plenty for photosynthesis
  • Light intensity - they can only absorb so much light anyway

3. Why is temperature a factor which can affect the rate of photosynthesis?

  • It affects the enzymes
  • It affects the photosynthesis directly
  • It affects the leaves

4. What is needed to provide the energy needed to make carbohydrates?

  • Water
  • Chlorophyll
  • Light
  • Carbon dioxide

5. To see if photosynthesis has occured it involves boiling the leaf in alcohol to remove the colour then staining with iodine, blue-black indicates starch (which is how glucose is stored). Which experiment?

  • Testing leaves for starch
  • Using oxygen and carbon dioxide sensors
  • Removing carbon dioxide


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