Chapter : 1. Nutrition
Light reaction
Light reaction : It is also called Hill Reaction.
It occurs in grana of thylakoids.
It is named as light reaction as it occurs only in presence of light.
Major Step : Absorption of light by chlorophyll.
Photolysis of water.
Reduction of CO2 to Carbohydrates.
In this process ADP changes to ATP & inorganic phosphate.
Release of oxygen into atmosphere.
Opening and Closing Stomata :
The opening and closing of stomata depend upon the turgid or flaccid state of the guard cells. When guard cells are in turgid state the stomatal aperture opens and when guard cells are in flaccid state the stomatal aperture closes. The inner wall of guard cells (towards pore) is thick and outer wall (towards other epidermal cells) is thin.
When the turgor pressure of the guard cells is increased the outer thinner wall of the guard cell is pushed out (towards the periphery) due to which a tension is created on the inner thicker wall thus pulling the inner thicker wall towards the periphery thus leading to the opening of stomatal aperture. On the contrary when the guard cells are in a flaccid state the outer thinner wall of guard cells returns to original position (moves towards pore) due to which tension on the inner wall is released which also returns to its original position and stomatal aperture gets closed again.
It occurs in grana of thylakoids.
It is named as light reaction as it occurs only in presence of light.
Major Step : Absorption of light by chlorophyll.
Photolysis of water.
Reduction of CO2 to Carbohydrates.
In this process ADP changes to ATP & inorganic phosphate.
Release of oxygen into atmosphere.
Opening and Closing Stomata :
The opening and closing of stomata depend upon the turgid or flaccid state of the guard cells. When guard cells are in turgid state the stomatal aperture opens and when guard cells are in flaccid state the stomatal aperture closes. The inner wall of guard cells (towards pore) is thick and outer wall (towards other epidermal cells) is thin.
When the turgor pressure of the guard cells is increased the outer thinner wall of the guard cell is pushed out (towards the periphery) due to which a tension is created on the inner thicker wall thus pulling the inner thicker wall towards the periphery thus leading to the opening of stomatal aperture. On the contrary when the guard cells are in a flaccid state the outer thinner wall of guard cells returns to original position (moves towards pore) due to which tension on the inner wall is released which also returns to its original position and stomatal aperture gets closed again.
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