Common features between lenticels and hydathodes are

Options

A. They allow exchange of gases
B. They always remain closed
C. They is no regulation of their opening and closing
D. They occur on the same organ of the plant

Answer

### Step-by-Step Solution:

1. **Understanding Lenticels**:
- Lenticels are small, lens-shaped openings found on the surface of the cork in old dicotyledonous plants.
- They are involved in the exchange of gases between the internal tissues of the plant and the external environment.

2. **Understanding Hydathodes**:
- Hydathodes are small pores located on the epidermis of leaves, particularly in herbaceous plants.
- They are responsible for the process of guttation, which is the exudation of water droplets from the leaves.

3. **Identifying Common Features**:
- Both lenticels and hydathodes are involved in physiological processes related to gas and water exchange.
- A key similarity is that they do not have a mechanism for opening and closing like stomata do. Instead, they remain open and do not regulate their aperture.

4. **Evaluating the Options**:
- **Option A**: They allow the exchange of gases - This is true for lenticels but not for hydathodes, which primarily deal with water.
- **Option B**: They always remain closed - This is incorrect as both structures do not close.
- **Option C**: There is no regulation of their opening and closing - This is true for both structures.
- **Option D**: They occur on the same organ of the plant - This is not necessarily true, as lenticels are found on stems while hydathodes are found on leaves.

5. **Conclusion**:
- The correct answer is **Option C**: There is no regulation of their opening and closing.