Gurad Cells

During transpiration in plants the guard cells in stromata will helps to regulate the size of the opening of that stromata thus transpiration will occur in controlled manner
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This question about “What do guard cells … ” was originally asked on Yahoo! Answers United States

Other Answers (3)

  • Guard cells are found on the underside of a leaf. They open and close the stomata
    When the leaf is full of water and is turgid, the guard cell opens the stomata to allow the exchange of gasses in the leaf for photosynthesis.
    However, when the leaf is short of water and is flaccid, the guard cell closes to prevent any water loss from the leaf (as water vapor) through the stomata.
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  • Guard cells are found on the lower epidermis of a leaf.
    They are found around stomata (holes). So depending on the amount of water in the leaf, the guard cells change their shape. They help reduce rate of transpiration, and water loss.
    So guard cells become flaccid when short of water, and so they close. This also happens when no carbon dioxide is needed, e.g. darkness/night-time. But when plenty of water is present, guard cells become turgid. The cell wall on the inner surface is very thick, and cannot curve as much as the outer surface. So the guard cell swells up, and curve away form each other, opening the stomata.


    Biology textbooks
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  • Guard Cells are responsible for the opening or closing of stomatal pores. In one stomata, there are two guard cells. Usually, guard cells contain chlorophyll, large vacuole and a prominent nucleus. In dicots, guard cells are shaped like kidneys while they are shaped like barbels in monocots.

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