In fern Salvinia, the adventitious roots are

Options

A. Storage in function
B. Spongy due to aerenchyma
C. Green and photosynthetic
D. Modificiation of leaf.

Answer

To solve the question regarding the adventitious roots in the fern Salvinia, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Plant**:
- Salvinia is an aquatic floating fern. It is important to recognize that this plant has unique adaptations that allow it to thrive in its aquatic environment.

2. **Identify the Roots**:
- The question specifically asks about the adventitious roots in Salvinia. Adventitious roots are roots that arise from non-root tissues, such as stems or leaves.

3. **Examine the Options**:
- The options provided are:
- A) Storage in function
- B) Spongy due to aerenchyma
- C) Green and photosynthetic
- D) Modification of a leaf

4. **Analyze Each Option**:
- **Option A**: Storage in function - This is not correct as the primary function of these roots is not for storage.
- **Option B**: Spongy due to aerenchyma - While some aquatic plants have aerenchyma, this does not accurately describe the roots of Salvinia.
- **Option C**: Green and photosynthetic - Salvinia does have green structures, but the roots are not primarily photosynthetic.
- **Option D**: Modification of a leaf - This is correct as the roots in Salvinia are actually modified leaves that help the plant float and maintain balance in water.

5. **Conclude the Answer**:
- Based on the analysis, the correct answer is **D) Modification of a leaf**. The adventitious roots in Salvinia are indeed modified leaves that serve a specific function in the aquatic environment.