Due to low atmospheric pressure,the rate of transpiration will

The pulling force in the plant body that develops at the top of a tree is caused by:

In the mechanism of opening of stomata,the important factor is the

The number of stomata present per $cm^2$ of leaf is

By which process is water lost from the plants in the form of water droplets?

Identify the purposes of transpiration.
$I -$ Transpiration creates a transpiration pull for absorption and transport in plants.
$II -$ It supplies water for photosynthesis.
$III -$ It transports minerals from the soil to all parts of the plant.
$IV -$ It cools leaf surfaces by $10-15^{\circ} C$ through evaporation.
$V -$ It maintains the shape and structure of plants by keeping cells turgid.