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Describe the mechanism of opening and closing of stomata

      

Describe the mechanism of opening and closing of stomata

  

Answers


Isacko
stomata close at night and open during daytime

This comes about due to changes in turgidity as a result of pH changes in guard cells.

In the dark carbon Iv oxide accumulates in the intercellular spaces

This raises concentration of carbonic acid

The pH drops (pH lowered)

Enzymes convert sugar into starch in guard cells

Osmotic pressure in guard cells is lowered

Water moves out of guard cells by osmosis making cells lose turgidity hence become ?accid

The stomata close

During day time there is photosynthesis hence the production of sugar, carbon IV oxide concentration is lowered, pH increases, guard cells become turgid causing stomata to open.

During the day potassium ions concentrate in guard cells, raising their osmotic pressure and causes then to open

In the night the concentration of potassium ions decreases increasing osmotic pressure in guard cells therefore causes stomata to open.
Mohaissack answered the question on October 5, 2017 at 11:41


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