Question

why do diurnal changes occur in osmotic potential of guard cells​

Answer 1

Answer:

Look 12 th biology book page no.130 starch-sugar interconversion theory.

Explanation:

During day time, enzyme phosphorylase converts starch to sugar ,thus increasing osmotic potential of guard cells closing entry of water there by guard cells are stretched and stoma widens.The reverse reaction occurs at night bringing about closer of stoma.

Answer 2

The diurnal change in the osmotic pressure that takes place in the dark cell help in the opening and closing of stomata.

Explanation:

• During the daytime there is sunlight and as a result of this there is production of the starch or carbohydrate in the guard cell.

• As a result of this the osmotic pressure increases and the water enters into the cell. Again in the night there is utilisation of the starch and there is removal of water from the guard cell. This helps in the opening and the closing of the stomata.

To know more about guard cell,

Why does Stomatal areas cells are called guard cells. Give reasons ..

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