Question

Plant cooling occurs due to
(a)Assimilation
(b)Guttation
(c)Photorespiration
(d)Transpiration

Answer 1

Hint: In hot summer days, water vapor from the foliar surface is lost as they are exposed directly to the sunlight. The plant cooling occurs during such high temperatures due to the process of evaporation. With stomata support, this phase is accompanied.

Complete answer:
Transpiration is the evaporation of plant stomata from the sun. The water that the roots consume is transferred up to the leaves where stomata are present. Stomata open during the daytime and rising temperatures contribute to water loss in the form of vapors. This is close to the phenomenon of sweating happening in humans. During high temperatures, it cools down the plants.
Assimilation is the plant absorption of minerals to fulfill their needs.
During the night, water swells out in the liquid form and this is called guttation.
Photorespiration is a change in photosynthesis as the oxygen levels increase. It usually occurs in the chloroplast of plants.
Transpiration is water evaporation due to heightened daytime temperature.
So, the correct answer is, 'Transpiration'.

Note: The water, warmed by the light, becomes vapor (evaporates), and moves through thousands of small pores (stomata), often on the underside of the surface of the leaves. This is called transpiration. It has two main functions such as cooling the plant and injecting water and minerals into the leaves for the purpose of photosynthesis. A plant absorbs water in its roots, is one example of transpiration.
Plant cooling is caused by transpiration and is similar to sweating occurring in humans after the fever begins to decrease. This sets natural body temperature.