Question

Which of the following process keeps the plant cool
(a) Photosynthesis
(b) Transpiration
(c) Respiration
(d) Translocation

Answer 1

Hint: The process in which the water loss from the plant surface in the form of vapor and it also supplies water for photosynthesis, transport minerals from the soil, maintains the shape and structure of the plants.

Complete answer:
Water is pulled through the plant and the driving force for this process is transpiration from the leaves. This is referred to as the cohesion-adhesion-transpiration pull model of water transport. The loss of water from the plant surface in the form of vapor is known as transpiration. It has more than one purpose: it supplies water for photosynthesis, it cools the leaf surface sometimes 10-15 degrees by evaporative cooling.

Additional Information: Transpiration plays a significant role in the concept of the soil-plant-atmosphere continuum.
- The water absorbed by the plant from the soil through the root system is lost into the atmosphere through the shoot system which in turn gets back to the soil through rains.
- The phenomenon of Transportation occurs mostly through stomata located on the leaves
- Two types of stomata found in plants are photoactive stomata and scotoactive stomata.
- Transpiration pull for absorption and Transportation in plants is due to transpiration, it supplies water for photosynthesis, transport minerals from the soil to all parts of the plant, cool the leaf surface, maintain the shape and structure of the plants by keeping cells turgid

So, the correct answer is 'Transpiration'.

Note: The cohesion-adhesion-transpiration pull model of water transport was proposed by Dixon in 1914.
-Cohesion, adhesion, and transpiration pull are the physical properties of water. Transpiration is dependent on these properties.