Friday 22 February 2013

2.42 describe the role of stomata in gas exchange

Stomata are minute wholes in the lower epidermis of the leaf. Guard cells regulate the opening and closing of the stomata; allowing carbon dioxide and oxygen to be exchanged between the leaf and the atmosphere. The guard cells absorb water and become turgid- opening the stomata- during the day. At night the guard cells are flaccid and so close the stomata.
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9 comments:

  1. Anonymous27 December 2013 at 03:26

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  2. Unknown6 May 2014 at 10:35

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  3. Unknown8 September 2014 at 08:55

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  4. Anonymous2 January 2015 at 15:58

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  5. Mike Tsang26 June 2017 at 02:48

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

    ReplyDelete
  6. SophieRice26 June 2017 at 17:58

    more can be found at

    http://igcse-biology-notes.blogspot.hk/2017/06/242-describe-role-of-stomata.html

    ReplyDelete

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