In which of the following petiolar leaf tendril is found ?

Options

A. Clematis
B. Citrus
C. Parkinsonia
D. Trapa

Answer

To solve the question "In which of the following petiolar leaf tendril is found?" we will analyze each option provided: Clematis, Citrus, Parkinsonia, and Trapa.

### Step-by-Step Solution:

1. **Understanding Petiolar Leaf Tendril**:
- A petiolar leaf tendril is a modified leaf petiole that helps in climbing. Tendrils are slender, thread-like structures that wrap around supports to help the plant climb.

2. **Analyzing the Options**:
- **Clematis**: In Clematis, the petiole of the leaf is modified into a tendril. This allows the plant to climb and support itself.
- **Citrus**: In Citrus plants, thorns are found, which are modifications of the stem, not the petiole. Thus, this option does not contain a petiolar leaf tendril.
- **Parkinsonia**: In Parkinsonia, the petiole is modified to look like a leaf (phyllode), and it can perform photosynthesis. This is not a petiolar leaf tendril.
- **Trapa**: In Trapa, the roots are modified into aerial roots known as hydrophiles. There are no petiolar leaf tendrils in this plant.

3. **Conclusion**:
- Based on the analysis, the only plant where the petiole is modified into a tendril is **Clematis**. Therefore, the correct answer is **Clematis**.

### Final Answer:
The correct option for the question is **Clematis**.

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