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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:

Opening the stomata

Opening the stomata

  • The guard cells can open the stomata by taking up lots of water, causing them to swell.
Closing the stomata

Closing the stomata

  • To close the stomata, the guard cells lose water and return to a limp state.
Jump to other topics
1

Cell Biology

1.1

What's in Cells?

1.2

Cell Division

1.3

Transport in Cells

2

Organisation

2.1

Principles of Organisation

2.2

Enzymes

2.3

Circulatory System

2.4

Non-Communicable Diseases

2.5

Plant Tissues, Organs & Systems

3

Infection & Response

4

Bioenergetics

5

Homeostasis & Response

5.1

Homeostasis

5.2

The Human Nervous System

5.3

Hormonal Coordination in Humans

5.4

Plant Hormones

6

Inheritance, Variation & Evolution

6.1

Reproduction

6.2

Variation & Evolution

6.3

Genetics & Evolution

6.4

Classification

7

Ecology

7.1

Adaptations & Interdependence

7.2

Organisation of Ecosystems

7.3

Biodiversity

7.4

Trophic Levels

7.5

Food Production

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