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describe traspiration opening and closing of stomata briefly(long question carring 8 marks)

Asked by hrushikesh.barik 21st February 2018, 9:08 PM
Answered by Expert
  • The loss of water in the form of vapour from the aerial parts of the plant is called transpiration.
  • Factors such as temperature, light, humidity, wind speed affect the rate of transpiration.

Mechanism of Opening and Closing of Stomata

  • The surfaces of spongy mesophyll cells in the leaf are exposed to 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 the connecting intercellular spaces and reaches the sub-stomatal space. Finally, it escapes in the atmosphere through the air.
  • Water absorbed by the roots rises 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 the intercellular spaces diffuses into the sub-stomatal space from where it finally goes out by diffusion through the stomata.
  • There are more stomata on the undersurface of a dicot leaf; therefore, more transpiration occurs from the undersurface.

Answered by Expert 22nd February 2018, 9:26 AM
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