Tuesday 12 February 2013

2.19 understand how varying carbon dioxide concentration, light intensity and temperature affect the rate of photosynthesis

Carbon dioxide
If there is insufficient carbon dioxide a plant will not be able to photosynthesis to its full potential. Because there is less carbon dioxide- less reactant- there has to be less product being made.

Light intensity
If the light is at a low intensity the rate of photosynthesis is lowered because the energy that the light provides is less, so the reaction is slowed down. A higher light intensity will enable photosynthesis to happen faster.

Temperature
In colder temperatures the rate of photosynthesis will decrease. If the temperature is too high however, the plant will not be able to photosynthesise.

This page has good graphs and explains in a different way: http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/photosynthesis/photosynthesisrev2.shtml

8 comments:

  1. What happens if the light intensity is too high will it have the same effect as high temperatures i.e. the plant will be unable to photosynthesise?

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    Replies
    1. No it it will still be able to photosynethises in fact it will be able to do it even faster light intensity will not denature enzymes which is why a very high temperature will slow downthe rate of photosynthesis

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  2. no the rate of reaction just won't get any faster, and will just remain the same no matter how much you raise the light intensity over a certain level. This is because the chlorophyll in the chloroplasts can only absorb a certain amount of light at a time.

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  3. The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  4. more at

    http://igcse-biology-notes.blogspot.hk/2017/06/219-understand-how-varying-carbon.html

    ReplyDelete