The relationship between sea-anemone and hermit crab is called protocooperation.

Answer

To determine whether the statement "The relationship between sea-anemone and hermit crab is called protocooperation" is correct, we can analyze the relationship step by step.

### Step-by-Step Solution:

1. **Understanding the Types of Relationships**:
- There are different types of symbiotic relationships in ecology, including mutualism and protocooperation.
- In mutualism, both species benefit from the relationship, and their survival is dependent on each other.
- In protocooperation, both species benefit, but their survival is not dependent on the relationship.

2. **Analyzing the Relationship**:
- The sea-anemone and hermit crab have a specific interaction where the sea-anemone attaches to the hermit crab's shell.
- The sea-anemone provides protection to the hermit crab from predators due to its stinging tentacles.
- In return, the hermit crab provides food for the sea-anemone by leaving behind food particles that the sea-anemone can consume.

3. **Assessing Dependency**:
- If the sea-anemone and hermit crab are separated, the survival of each species is not significantly affected. The hermit crab can still survive without the sea-anemone, and vice versa.
- This indicates that their relationship is beneficial but not essential for their survival.

4. **Conclusion**:
- Since both species benefit from the relationship without being dependent on each other for survival, this relationship is indeed classified as protocooperation.

Therefore, the statement "The relationship between sea-anemone and hermit crab is called protocooperation" is **correct**.