3.2.1

Guard Cells & Stomata

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Guard Cells and Stomata

Stomata are gaps in the lower epidermis of leaves that facilitate (make easier) the diffusion of gases, including evaporated water, in and out of the leaf. Guard cells can open and close the stomata:

Illustrative background for Opening the stomataIllustrative background for Opening the stomata ?? "content

Opening the stomata

  • The guard cells can open the stomata by taking up lots of water, causing them to swell.
Illustrative background for Closing the stomataIllustrative background for Closing the stomata ?? "content

Closing the stomata

  • To close the stomata, the guard cells lose water and return to a limp state.

Jump to other topics

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

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