Petiole is modified into green leafy structure called

Options

A. Phyllode
B. Phylloclade
C. Cladode
D. Foliaceous petiole.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the modification of the petiole into a green leafy structure. The petiole is the stalk that attaches the leaf blade to the stem.

2. **Identifying Options**: The options provided are:
- Phyllod
- Phylloclade
- Polyaceous petiole

3. **Defining Phyllod**: Phyllod is a modification of the petiole into a green, leaf-like structure. It is commonly found in xerophytic plants, which are adapted to arid environments.

4. **Function of Phyllod**: Phyllods perform photosynthesis, which is the process by which plants make their own food using sunlight. Additionally, they help in reducing the rate of transpiration, which is the loss of water from the plant in the form of water vapor.

5. **Differentiating Other Options**:
- Phylloclade is a modification of the stem, not the petiole.
- Polyaceous petiole is not a recognized term in botany related to petiole modifications.

6. **Conclusion**: Based on the definitions and functions, the correct answer to the question is that the petiole is modified into a green leafy structure called **phyllod**.

**Final Answer**: Phyllod

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