Which among the following is a rootless plant?

Options

A. Nymphaea
B. Sagittaria
C. Ceratophyllum
D. Vallisneria

Explanation

To determine which among the following is a rootless plant, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify a plant that does not have roots.

2. **Analyzing the Options**:
- The options provided are likely hydrophytic plants, which grow in water.

3. **Option 1: Nymphaea (Water Lilies)**:
- Nymphaea includes water lilies and lotus.
- These plants have roots that anchor them in the soil underwater.
- **Conclusion**: Nymphaea is not a rootless plant.

4. **Option 2: Sagittaria (Arrowheads)**:
- Sagittaria, commonly known as Arrowheads, also has roots that are submerged in the soil.
- These plants grow partially above water but still possess roots.
- **Conclusion**: Sagittaria is not a rootless plant.

5. **Option 3: Ceratophyllum**:
- Ceratophyllum is a type of hydrophytic plant that is submerged in water.
- Importantly, Ceratophyllum lacks roots even in its embryonic stage.
- **Conclusion**: Ceratophyllum is a rootless plant.

6. **Option 4: Vallisneria (Eel Plant)**:
- Vallisneria is another submerged plant, but it has roots that anchor it in the soil.
- **Conclusion**: Vallisneria is not a rootless plant.

7. **Final Answer**:
- The correct answer is **Ceratophyllum**, as it is the only plant among the options that does not have roots.