A cladode (cladophyll) is green leaf like modified aerial stem and is

Options

A. thorn
B. one internode long phyllode
C. one or two internode long branch
D. a leaf modification

Answer

### Step-by-Step Solution:

1. **Understanding Cladodes**:
- A cladode, also known as a cladophyll, is a modified stem that resembles a leaf. It is green and performs photosynthesis.

2. **Characteristics of Cladodes**:
- Cladodes are typically green due to the presence of chlorophyll, which is essential for photosynthesis.
- They are modifications of aerial stems, meaning they grow above the ground.

3. **Types of Cladodes**:
- Cladodes can vary in structure; they can be:
- Thorn-like structures
- One internode long
- One or two internode long branches
- Leaf modifications

4. **Phylloclades**:
- Cladodes belong to a category called phylloclades, which are flattened, photosynthetic, and succulent stems.
- They are adapted for photosynthesis and water storage.

5. **Examples of Cladodes**:
- Common examples of plants with cladodes include asparagus and ruscus. These plants typically have one or two internodes in their structure.

6. **Conclusion**:
- Based on the characteristics and examples discussed, the correct classification of a cladode is that it is a green, leaf-like modified aerial stem, which can be one or two internodes long.