In a plant organ which is convered by periderm and in which the stomata are absent, some gaseous exchange still takes place through

Options

A. lenticels
B. trichomes
C. aerenchyma
D. pneumatophores

Answer

To solve the question regarding gaseous exchange in a plant organ covered by periderm and lacking stomata, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure**: Recognize that the plant organ in question is covered by periderm, which is a protective layer that replaces the epidermis in woody plants. This layer is typically impermeable to gases.

2. **Identifying the Absence of Stomata**: Since the question states that stomata are absent, we need to consider alternative structures that facilitate gas exchange in plants.

3. **Evaluating the Options**:
- **Trichomes**: These are hair-like structures on the surface of plants and are not primarily involved in gas exchange.
- **Erenchyma**: This tissue contains air spaces and is involved in gas exchange, but it is more common in aquatic plants and does not directly relate to the periderm context.
- **Pneumatophores**: These are specialized aerial roots found in mangrove plants that assist in gas exchange, but they are not directly related to the periderm of other plant organs.
- **Lenticles**: These are small openings in the periderm that allow for gas exchange between the internal tissues of the plant and the atmosphere.

4. **Conclusion**: Based on the evaluation of the options, the correct answer is **lenticles**. They facilitate gaseous exchange even when stomata are absent and are specifically adapted for this function in woody plants.

### Final Answer:
Lenticles