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Flashcards · Biology · Photosynthesis

Rate of Photosynthesis and Limiting Factors

11 cards

  1. What is a limiting factor?

    A factor in short supply that sets the rate of a reaction.

  2. Why does more light increase photosynthesis?

    Light provides the energy for the reaction.

  3. Why does more carbon dioxide increase photosynthesis?

    It is a reactant, so more is available.

  4. Why does the rate fall at high temperatures?

    The enzymes are denatured.

  5. What does a flat part on a rate graph show?

    Another factor is now limiting.

  6. What does a rising part of the graph show?

    The factor on the x axis is limiting.

  7. How do you calculate a rate?

    Amount of product or reactant ÷ time.

  8. What is a plateau?

    A flat part of a graph where the rate stops changing.

  9. (HT) What does it mean if factors interact?

    Any one of them might be the limiting factor.

  10. (HT) Why might adding extra heat be a waste of money?

    If temperature is not the limiting factor, the rate does not increase.

  11. Three graphs with curves and no labels. Describe the shape of each graph and say what is limiting. The same three graphs with their labels and marks.

    Light and carbon dioxide: the rate rises then levels off, and another factor is limiting on the flat part. Temperature: it rises to an optimum, then falls because enzymes are denatured.