Name the cap which covers the gills in fishes:

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure**: In fishes, gills are the respiratory organs that allow them to extract oxygen from water. These gills need to be protected and covered.

2. **Identifying the Cover**: The structure that covers the gills in bony fishes is known as a cap. This cap serves multiple functions, including protection and facilitating respiration.

3. **Naming the Cap**: The specific name of the cap that covers the gills in fishes is called the **operculum**.

4. **Function of the Operculum**: The operculum is a bony flap that not only covers the gills but also allows water to flow over the gills, which is essential for respiration. It helps in the movement of water, enabling fishes to breathe efficiently.

5. **Conclusion**: Therefore, the answer to the question is that the cap which covers the gills in fishes is called the **operculum**.

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