Question

What is the name of aerating pores in the bark of stem?

• A. Stomata
• B. Lenticel
• C. Guttation pore
• D. All of the above

Answer 1

Answer: (B)

Lenticel

• Stomata are pores found on the surface of leaves. These pores help in exchange of gases from the environment and also in transpiration.
  
• Lenticels are pores found on bark of woody plants which allow gaseous exchange between atmosphere and internal tissues.
  
• At night stomata are closed and soil moisture content is high. This leads to high root pressure which leads to water accumulation in plants. This excess sap leaks from the tip of leaves and this process of exudation of xylem sap is known as guttation. Guttation pores are not aerating and do not allow gaseous exchange, they are only involved in getting rid of excess water.

Thus the correct answer is B.