Which of the following is $NOT$ a function of transpiration?

Which of the following is ineffective on transpiration?

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.

Exchange of gases between the plant and the atmosphere is governed by:

In both transpiration and evaporation,water is lost in the form of vapour,yet they differ because:

When strips of cobalt chloride paper are placed on either side of a dorsiventral leaf,why do the strips on the lower side become pink more speedily?