Which of the following is a water-pollinated plant?

Options

A. water hyacinth
B. seagrass
C. water lily
D. common pansy

Answer

To solve the question "Which of the following is a water-pollinated plant?", we will analyze each of the given options one by one.

### Step 1: Analyze the options

1. **Water Hyacinth**:
- Water hyacinth is known to exhibit entomophily, which means it is pollinated by insects. Therefore, it is not a water-pollinated plant.

2. **Seagrass**:
- Seagrass is known for its unique method of reproduction. It exhibits hydrophily, which means it is pollinated by water. The female flowers of seagrass remain submerged, and the pollen grains are carried by water currents to the stigma of the flowers. This makes seagrass a water-pollinated plant.

3. **Water Lily**:
- Water lilies have flowers that are adapted for anemophily, which means they are pollinated by wind. They produce a large number of stamens to facilitate this type of pollination. Therefore, water lily is not a water-pollinated plant.

4. **Common Pansy**:
- Common pansy is also an insect-pollinated plant, meaning it relies on insects for pollination. Thus, it is not a water-pollinated plant.

### Conclusion:
After analyzing all the options, the only plant that is water-pollinated is **Seagrass**.

### Final Answer:
**Seagrass** is the correct answer as it is a water-pollinated plant.

---