How is pollination carried out in water plants?

Explanation

**Step-by-Step Solution:**

1. **Understanding Aquatic Plants**: Aquatic plants are those that grow in water. Some of these plants have flowers that emerge above the water's surface, while others have flowers that remain submerged.

2. **Types of Pollination in Water Plants**: There are two main types of pollination that occur in water plants:
- **Hypohydrophilae**: This type of pollination occurs below the surface of the water. In this case, pollen is transferred from one flower to another while submerged. An example of a plant that undergoes hypohydrophilae is **Ceratophyllum**.
- **Epihydrophilae**: This type of pollination occurs above the water's surface. Here, pollen is transferred from flowers that are above the water. An example of a plant that undergoes epihydrophilae is **Valisneria spiralis**.

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