Stomata in angiosperms do not open during:

When sugar in guard cells is converted into starch,the stomatal pore $..........$

Water stomata are found in

Which of the processes is responsible for the loss of sugars and salts from plants?

What causes the opening and closing of guard cells of stomata during transpiration? Describe point-wise.

$A.$ In dry atmosphere,the relative humidity is low,so the rate of transpiration increases.
$B.$ Slow breeze promotes the rate of transpiration.
$C.$ $ABA$ promotes transpiration.
$D.$ $A$ high salt concentration in soil water increases transpiration.