closing layer of lenticels show deposition of

Options

A. Cutin
B. Lignin
C. Pectin
D. Suberin

Answer

### Step-by-Step Solution:

1. **Understanding Lenticels**: Lenticels are small openings found on the stems of woody plants, particularly in old dicotyledons. They serve as a means for gas exchange, similar to stomata found on leaves.

2. **Structure of Lenticels**: The structure of lenticels includes an outer raised margin and a central region filled with loosely arranged parenchymatous cells, known as complementary cells. These cells facilitate the exchange of gases.

3. **Closing Layer of Lenticels**: The closing layer of lenticels is crucial for their function. This layer is responsible for regulating the exchange of gases and protecting the internal tissues.

4. **Composition of the Closing Layer**: The closing layer of lenticels is characterized by the deposition of specific substances. Among the options provided (cutin, lignin, pectin, and suberin), the correct answer is suberin.

5. **Suberin in Cork Tissue**: The lower part of the lenticels contains cork tissues, which are composed of cells with suberized (suberin-rich) cell walls. Suberin is a waxy substance that provides protection and prevents water loss.

6. **Conclusion**: Therefore, the correct answer to the question regarding the deposition in the closing layer of lenticels is suberin.

### Final Answer:
The closing layer of lenticels shows deposition of **suberin**.