Question

In woody trees, the exchange of gases between the outer atmosphere and the internal tissue of the stem takes place through :

• A. Aerenchyma
• B. Stomata
• C. Trichomes
• D. Lenticels

Answer 1

The correct option is D

Lenticels

The correct option is D:

Explanation of the correct option :

1. Lenticels are porous tissues having cells with very large intercellular spaces.
2. They are present in the bark of a tree.
3. They help in the gaseous exchange of oxygen and carbon dioxide between the outer atmosphere and the internal tissue of the stem.

Explanation of the incorrect option :

Option A:

1. Aerenchyma is a soft tissue in plants containing air spaces.
2. It is found mainly in aquatic plants.

Option B:

Stomata are openings present in leaves that help in gaseous exchange.

Option C:

Trichomes are hair-like outgrowths on stems of various plants that help in the secretion of secondary metabolites.

Final answer: In woody trees, the exchange of gases between the outer atmosphere and the internal tissue of the stem takes place through lenticels.