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Stomata

Hydathode

1. It is the opening present for loss of water in the gaseous form.

1. It is the opening present for loss of water in the liquid form.

2. The opening is guarded by the guard cells which are kidney shaped.

2. No such cells are present for guarding the opening

3. The stomata leads to a cavity into the interior of the epidermis called as the respiratory chamber or substomatal chamber.

3. The hydathode is followed by a large intercellular space or air chamber. The loosely arranged cells beneath the air chamber at the end of the xylem element are known as epithem.

4. Stomatal transpiration is controlled by the opening and closing of the stomata.

4. Guttation takes place due to the root pressure.

5. Transpiration occurs in the day time during the time when the stomata is opened

5. Guttation occurs at the night and also at low transpiration.

6. Usually the stomata remain open during the day time and closed during the night time.

6. The hydathode remains open during the day as well as the night time.

7. Stomata is more common on the abaxial surface than adaxial surface.

7. The hydathodes are seen at the tips of the veins of the leaves.

 

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