Question

Which of the following is true about transpiration in plants?

• A. Transpiration helps in the absorption of minerals from the soil.
• B. Transpiration cools the plant and helps in water regulation.
• C. Transpiration decreases water absorption from the roots.
• D. Transpiration occurs only through the roots of the plant.

Hint:

Transpiration is an essential physiological process in plants that not only cools the plant but also helps in the movement of water and nutrients from the roots to the leaves.

Answer 1

The Correct Option is B

Transpiration is the process by which water is absorbed by the plant roots from the soil and then evaporated through tiny pores called stomata present in the leaves and stems. Transpiration plays a crucial role in maintaining the plant’s homeostasis. 

Let's analyze the options: 
Option 1: Transpiration helps in the absorption of minerals from the soil. While transpiration is essential for water movement, the absorption of minerals is primarily driven by active transport mechanisms in the roots, not by transpiration. 

Option 2: Transpiration cools the plant and helps in water regulation. This statement is correct. Transpiration helps cool the plant by releasing latent heat as water evaporates, and it also maintains water balance within the plant. As water evaporates from the leaf surface, it creates a pull that draws more water up through the plant, facilitating water regulation. 

Option 3: Transpiration decreases water absorption from the roots. This is incorrect. Transpiration actually aids in water absorption from the roots because it generates a suction pressure that helps pull water from the soil into the plant. 

Option 4: Transpiration occurs only through the roots of the plant. This is incorrect. While some water absorption occurs through the roots, transpiration mainly takes place through the stomata on the leaves, although small amounts also occur through other plant parts like stems. Thus, the correct answer is Option 2, as transpiration helps in cooling the plant and regulating its water balance.