Answers

2015-05-29T17:24:00+05:30
stomata are the tiny pores present on the surface of the leaves, by the process called the large amount of gaseous exchange takes place in leaves through these pores. But exchange of gases also takes place on the surface of stem roots and leaves. A large amount of water is lost through these pores. The plant closes these pores when carbon dioxide is not required for photosynthesis. 

Guard cells performs the opening and closing of these pores. The guard cells swell when water flows into these pores and stomatal pores get open, and as the water shrinks the guard cell closes.

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