Question

The bulk of transpiration in all trees occurs through

• A. Stomata
• B. Cuticle
• C. Lenticels
• D. Hydathodes

Answer 1

The correct option is A

Stomata

The correct option is A.

Explanation for the correct option

1. Transpiration is the process of water loss from the leaves of the plants in the form of water vapors.
2. It occurs through the aid of various processes like stomatal, cuticular, and lenticular transpiration.
3. The most common transpiration type that occurs in trees is through small apparatus present in the leaf's epidermis called stomata.

Explanation for incorrect options

Option B

1. The cuticle is the plants' outermost layer covering leaves, flowers, fruits, and other non-woody parts.
2. It plays multiple roles like protecting plants from chemical attack, drought, high temperature of the atmosphere, and harmful sun rays.
3. It also plays a role in losing water from the water to very little extent.

Option C

1. Lenticels are pores in the woody parts of the plant.
2. It helps in exchanging gases between the plant and the outer environment.
3. It plays a very minor role in the loss of water from the trees.

Option D

1. Hydathodes are the small water pores located on the margins of the leaves.
2. These are unregulated pores involved in the loss of water due to increased root pressure.
3. The loss of water is high through hydathodes but not higher than in stomata.

Stomata are the site for maximum transpiration in higher plants.