Hydathodes are also called

Stomatal movement is not affected by

Stomatal mechanism operates in response to

$A-$ 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.

Steward's theory of stomatal opening and closure assumes the presence in the guard cells of which of the following enzymes?

In a stomatal apparatus,cellulosic microfibrils are oriented: