Explain the mechanism of stomatal transpiration step by step
Asked by chumki.banerjee001 | 29th Jan, 2019, 06:16: PM
Mechanism of stomatal transpiration:
- The surfaces of spongy mesophyll cells in leaf are exposed to the intercellular spaces.
- These cells give out a thin film of water. Water from this film evaporates.
- Water vapour formed saturates the air in the intercellular spaces, diffuses into connecting intercellular spaces and reaches the sub-stomatal space. Finally, it escapes in the atmosphere through air.
- Water absorbed by roots rises up through the stem and reaches the tissues of leaves.
- The cell sap in each cell exerts a turgor pressure outward on the cell wall. This pressure forces some water out of the cell wall into the air space between the cells, i.e. intercellular space.
- Here, the water evaporates and the water vapour from intercellular spaces diffuses into the sub-stomatal space from where it finally goes out by diffusion through stomata.
Answered by Sheetal Kolte | 29th Jan, 2019, 07:06: PM
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