What is transpiration? Describe mechanism of opening and closing of st

1.	What is transpiration? Describe mechanism of opening and closing of stomata.
Answer» 1. The loss of water in the form of vapour is called transpiration. 2. Stomatal transpiration is a main type of transpiration where minute pores are concerned with it. 3. Stomata are bounded by two guard cells which in turn are surrounded by accessory cells. 4. Opening and closing of stomata is controlled by turgidity of guard cells. 5. When guard cells become turgid due to endosmosis their lateral thin and elastic wall bulges or stretch out. 6. The inner thick and inelastic wall is pulled apart, thus the stoma opens during daytime 7. At night when guard cells become flaccid due to exosmosis the wall relaxes and stoma closes. 8. Endosmosis and exosmosis takes place due to changes in osmotic potential of guard cells.

What is transpiration? Describe mechanism of opening and closing of stomata.

Answer»

1. The loss of water in the form of vapour is called transpiration.

2. Stomatal transpiration is a main type of transpiration where minute pores are concerned with it.

3. Stomata are bounded by two guard cells which in turn are surrounded by accessory cells.

4. Opening and closing of stomata is controlled by turgidity of guard cells.

5. When guard cells become turgid due to endosmosis their lateral thin and elastic wall bulges or stretch out.

6. The inner thick and inelastic wall is pulled apart, thus the stoma opens during daytime

7. At night when guard cells become flaccid due to exosmosis the wall relaxes and stoma closes.

8. Endosmosis and exosmosis takes place due to changes in osmotic potential of guard cells.