Correct Option: C. for gaseous exchange Detailed Explanation: Lenticels are small openings found on the stems and branches of woody plants. Their primary function is to facilitate the exchange of gases between the internal tissues of the plant and the external environment. This process is crucial for the plant's respiration and overall metabolic functions.

1. Structure of Lenticels:
2. Lenticels are formed from loosely arranged cells that create spaces or pores. These spaces allow gases such as oxygen and carbon dioxide to diffuse in and out of the plant.
3. They are typically found in the bark of trees and shrubs, where the outer layer is often impermeable to gases due to the presence of a protective layer called the cork.
4. Gaseous Exchange Process:
5. During photosynthesis, plants take in carbon dioxide (CO₂) from the atmosphere and release oxygen (O₂). While most gas exchange occurs through stomata (tiny openings on leaves), lenticels play a vital role in the exchange of gases in the stems and branches, especially when stomata are closed (e.g., at night).
6. The lenticels allow for the diffusion of oxygen into the plant tissues for cellular respiration and the release of carbon dioxide as a byproduct.
7. Importance of Gaseous Exchange:
8. Gaseous exchange is essential for the survival of the plant. Oxygen is required for cellular respiration, which provides energy for growth and development. Conversely, carbon dioxide is necessary for photosynthesis, which produces the sugars that fuel the plant's energy needs.

Why Other Options Are Incorrect:

• Option A: to remove excess water in plants:
• This option is incorrect because lenticels do not function to remove excess water. Instead, they are involved in gas exchange. Water regulation in plants is primarily managed through stomata and other mechanisms, such as transpiration.
• Option B: to absorb water from the atmosphere:
• Lenticels do not absorb water. While some plants can absorb moisture from the air through specialized structures (like trichomes or aerial roots), lenticels are not designed for this purpose. Their role is strictly related to gas exchange.
• Option D: to absorb light:
• This option is also incorrect. Lenticels do not absorb light. The primary structures responsible for light absorption in plants are chloroplasts found in the leaves. Lenticels are not involved in photosynthesis; their function is limited to facilitating gas exchange.

Summary of Key Points:

• Lenticels are small openings on the stems and branches of woody plants that allow for gaseous exchange.
• They enable the diffusion of oxygen and carbon dioxide, which is essential for respiration and photosynthesis.
• Lenticels are not involved in water absorption or light absorption, which are functions of other plant structures.
• Understanding the role of lenticels is crucial for comprehending how plants manage gas exchange and maintain metabolic processes.