Guard Cell

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by SNGSS1T24
Last updated 3 years ago

Discipline:
Science
Subject:
Cell Biology

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Guard Cell

The cell contains the chloroplasts, sap vacuole, nucleus and the cell wall (thick inner wall and thin outer wall)

Parts of the guard cell

Guard cell

The picture on the left shows the guard cells under light microscope while the the picture on the right shows the picture of the guard cells under electron microscope.

What is a guard cell?A guard cell is a specialized epidermal plant cell that forms the boundaries of the stomata.Where are the guard cells located?Guard cells are specialized cells located in the lower leaf epidermis of plants.What is the function of the guard cells?They help to regulate the rate of transpiration by opening and closing the stomata. When the guard cells lose water on a hot day, they become deflated and push together, thus closing off the stoma. This clever strategy prevents the plants from dehydrating.

How does the differences between guard cells and epidermal cells help the guard cells to carry out its special function?

Our sources-Wikipedia-http://www.phschool.com/science/biology_place/labbench/lab9/guard.html-http://www.phschool.com/science/biology_place/glossary/g.html#guard cell-yahoo! answers-http://www.phschool.com/www.youtube.com

1) Guard cells have chloroplast, while epidermal cells do not. This way, the guard cells photosynthesize, causing glucose to accumulate in the presence of sunlight and the guard cells absorb water by osmosis from epidermal cells that have no chloroplasts. Then, the guard cells become turgid and the stoma opens.2) Guard cells are much smaller than the epidermal cells. The guard cells need to be small enough to open and close up the stoma.3) The cell walls of guard cells are not uniform (less flexible). Inner walls are thicker than the outer walls (more flexible). Epidermal cells are uniformly thin.

Done by: Teo Jia Yi Daphne and Yupar Tin Win


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