Photosynthesis

  • Created by: mrowson
  • Created on: 14-05-17 17:38
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  • Photosynthesis
    • carbon dioxide and water are converted into glucose and oxygen. The reaction requires light energy, which is absorbed by a green substance called chlorophyll.
    • Photosynthesis takes place in leaf cells. These contain chloroplasts, which are tiny objects containing chlorophyll.
    • carbon dioxide + water (+ light energy)    ?    glucose + oxygen
    • Plants absorb water through their roots, and carbon dioxide through their leaves.
    • The stored starch can later be turned back into glucose and used in respiration. Oxygen is released as a by-product of photosynthesis.
    • Three factors can limit the speed of photosynthesis - light intensity, carbon dioxide concentration and temperature.
    • Without enough light, a plant cannot photosynthesise very quickly, even if there is plenty of water and carbon dioxide. Increasing the light intensity will boost the speed of photosynthesis.
    • Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.Temperature

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