Lenticels and hydathodes are small pores with following common attributes

Options

A. they remain open
B. they allow exchange of gases
C. they always remain closed
D. they are found on the same organs of plants

Answer

### Step-by-Step Solution:

1. **Understanding Lenticels and Hydathodes**:
- Lenticels are small openings found on the bark of woody plants, primarily on the trunks and stems. They allow for gas exchange between the internal tissues of the plant and the atmosphere.
- Hydathodes are specialized structures located at the tips of leaves. They are involved in the process of guttation, which is the exudation of water in liquid form.

2. **Common Attributes**:
- Both lenticels and hydathodes are characterized by the fact that they **lack guard cells**. This means that their openings are not regulated like the stomata, which do have guard cells that control their opening and closing.
- Because they lack guard cells, both lenticels and hydathodes **remain open continuously**. This is a key common attribute.

3. **Functionality**:
- Lenticels facilitate the exchange of gases, allowing oxygen to enter and carbon dioxide to exit, which is essential for the plant's respiration and transpiration processes.
- Hydathodes, on the other hand, are involved in releasing excess water from the plant, particularly during periods of high moisture, contributing to guttation.

4. **Location**:
- Lenticels are found on the **bark of trees**, while hydathodes are located at the **tips of leaves**. This distinction is important but does not pertain to their common attributes.

5. **Conclusion**:
- The common attribute between lenticels and hydathodes is that **they remain open** and are not subject to regulation like stomata. Therefore, the correct answer to the question is that they both **remain open**.