Question

Plants exhibit sub epidermal evaporation of water during
A)Photosynthesis
B)Guttation
C)Transpiration
D)Respiration

Answer 1

Hint: The epidermis is the outermost layer of the plant which contains cutting. The subepidermal layer is present in the leaves which comprises stomata and lenticels through which the water vapour along with the other gaseous exchange takes place.

Complete answer:
To solve this question, we must know about the loss of water through evaporation.

The plant loses water during the day time in the form of water vapour through the minute pores present on the surface of the leaves and the stem. This process is called transpiration. The minute pores are present in the subepidermal region as the epidermis is coated with wax to protect the excess loss of water or any mechanical injury.

Photosynthesis- It is the process by which the plants prepare their own food by utilising carbon dioxide water in the presence of sunlight and chlorophyll. The food in the form of carbohydrates is prepared in the leaves.

Guttation- It is the process of water loss in the form of droplets from the edges of the leaves. It generally occurs in the morning. The water droplets come out from the hydathodes which are present at the end of the veins.

Respiration- It is a process of breaking down food by utilising oxygen and emitting out carbon dioxide. The oxidation of food liberated energy in the form of ATP.

Hence, the correct answer is option (C)

Note: The transpiration occurs through stomata which are guarded by the guard cells which remain open during the day only. The transpiration is important as it gives the cooling effect to the plant. Also the pressure generated by transpiration helps in uptake of water and nutrients by the roots.