In Eichhornia (water hyacinth), the spongy, swollen pulvinus structure is

Options

A. petiole
B. leaf base
C. rachis
D. pedicel

Answer

To determine the spongy, swollen pulvinus structure in Eichhornia (water hyacinth), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Plant**: Understand that Eichhornia, commonly known as water hyacinth, is a free-floating aquatic plant. It is important to recognize its characteristics, including its structure.

2. **Understand the Structures**: Familiarize yourself with the different parts of the plant:
- **Petiole**: The stalk that attaches the leaf to the stem.
- **Leaf Base**: The part of the leaf that connects to the petiole.
- **Rachis**: The central axis of a compound leaf.
- **Pedestal**: A supporting structure, but not commonly referred to in the context of Eichhornia.

3. **Focus on the Pulvinus**: The question specifically asks about the "spongy, swollen pulvinus structure." In Eichhornia, this structure is associated with the petiole, which is known for its spongy and swollen characteristics.

4. **Analyze the Petiole**: The petiole in water hyacinth is not just a simple stalk; it contains air-filled lacunate tissue, which contributes to its buoyancy and sponginess. This adaptation allows the plant to float on water surfaces effectively.

5. **Conclusion**: Based on the understanding of the structures and their functions, the spongy, swollen pulvinus structure in Eichhornia is identified as the **petiole**.

### Final Answer:
The spongy, swollen pulvinus structure in Eichhornia (water hyacinth) is the **petiole**.

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