When the entire stem with its all branches become green, flat, fleshy leafy to do photosynthesis and leaves are modifed intospines, it is called

Options

A. turion
B. phylloclade
C. phyllode
D. bulbils

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question describes a plant structure where the entire stem and its branches become green, flat, fleshy, and leafy for photosynthesis, while the leaves are modified into spines. We need to identify this structure from the given options.

2. **Analyzing the Options**:
- **Option 1: Turion**: This is a type of fleshy bud found in aquatic plants that helps them survive unfavorable conditions. It is not relevant to the description in the question.
- **Option 2: Phylloclade**: This is a modified stem that is flattened, green, and fleshy, which performs the function of photosynthesis. In these plants, the leaves are often modified into spines to reduce water loss. This fits the description perfectly.
- **Option 3: Phyllode**: This refers to a modification of the petiole (the stalk that attaches the leaf blade to the stem), which becomes flattened and functions like a leaf. However, it does not describe a fleshy stem.
- **Option 4: Bulbil**: This is a vegetative propagule found in some plants, such as agave. It does not match the description provided in the question.

3. **Identifying the Correct Answer**: Based on the analysis, the only option that fits the description of a green, flat, fleshy stem that performs photosynthesis and has modified leaves (spines) is **Phylloclade**.

4. **Conclusion**: The correct answer is **Option 2: Phylloclade**.