Question

The main function of the leaf is

• A. Transpiration
• B. Exchange of gases
• C. Photosynthesis
• D. Cooling

Answer 1

The correct option is C

Photosynthesis

The correct option is C.

Explanations for the correct option:

1. The leaf is the green flattened structure that is the main site of photosynthesis and transpiration.
2. The leaves contain chlorophyll pigment in their chloroplasts that absorb light energy and are utilized to generate organic compounds from water, carbon dioxide, and minerals.
3. It is a light-driven oxidation-reduction process that produces oxygen, hydrogen ions, and electrons.
4. Light energy is absorbed by chlorophyll, the compound that gives plants their distinctive green color.
5. The leaf epidermis, which is continuous with the stem epidermis, protects the internal leaf structure.

Explanations for the incorrect options:

Option A:

1. Transpiration is the process by which water is lost mostly via the stomatal openings.
2. Factors such as the number of open stomata and the water content of the plant influence the rate of transpiration.

Option B:

1. The gaseous exchange in leaves is conducted via stomata and lenticels.
2. Gas exchange occurs via the opening and closing of the stomata in the inferior of leaves.

Option D:

1. Transpiration provides a cooling effect to that plant by releasing water vapors into the surrounding air.

Final answer: The main function of the leaf is photosynthesis.