The opening and closing of stomata are caused by:

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.

Select the correct option regarding the factors affecting transpiration.
$I -$ Temperature
$II -$ Light
$III -$ Structure of stomata
$IV -$ Humidity
$V -$ Number and distribution of stomata
$VI -$ Percentage of open stomata
$VII -$ Water status of the plant
$VIII -$ Wind speed
Identify the external factors and internal factors respectively.

What happens if a plant in a potometer is kept under a fan or in bright light? The bubble of the potometer would:

Wilting and curling of leaves occur due to which factor?

Excessive loss of water causes wilting of leaves; it can be prevented by: