Conversion of starch to organic acid is essen | vedclass

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(B) According to the starch-sugar interconversion theory proposed by $Sayre$ $(1926)$,the opening and closing of stomata are regulated by the intercon

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Stomatal opening

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(B) According to the starch-sugar interconversion theory proposed by $Sayre$ $(1926)$,the opening and closing of stomata are regulated by the interconversion of starch and soluble sugars. During the day,the $pH$ of the guard cells increases due to the consumption of $CO_2$ in photosynthesis. This high $pH$ triggers the conversion of starch into organic acids (like malic acid) and glucose$-1-$phosphate. This increases the osmotic concentration of the guard cells,leading to the endosmosis of water,which causes the guard cells to become turgid and the stomata to open. Therefore,the conversion of starch to organic acid is essential for stomatal opening.

Conversion of starch to organic acid is essential for

Similar Questions

In darkness,the stomata close because:

The process of the escape of liquid from the tip of an uninjured leaf is called:

$A-$ The inner wall of each guard cell,towards the pore or stomatal aperture,is thick and elastic.
$R -$ Cellulose microfibrils are oriented longitudinally in the cell walls of the guard cells.

$A$ : During stomatal opening there is relative change in $TP$ of guard cell and subsidiary cell.
$R$ : $TP$ of subsidiary cell decreases during opening and that of guard cells increase.

Assertion : Light is a very important factor in transpiration.
Reason : Light induces stomatal opening and darkness closing of stomata. Therefore,transpiration increases in light and decreases in dark.

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