Which of the following statements is incorrect?

Options

A. Option1 lichen , an association of fungus and algae is an example of mutualism.
B. Option2 those epiphyets which use other plants for support only and not for water or food supply and are examples of commensalism.
C. Option3 sea-anemone on hermit - crab is an example of protocooperation .
D. Option4 mutualism, protocooperation, commensalism cannot be included under symbiosis.

Explanation

To solve the question of identifying the incorrect statement among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Option 1**:
- The statement claims that lichen, which is an association of fungus and algae, is an example of mutualism.
- This is **true** because lichens represent a mutualistic relationship where fungi provide structure and protection, while algae (or cyanobacteria) perform photosynthesis to provide food.

2. **Analyze Option 2**:
- The statement mentions that epiphytes use other plants for support only and not for water or food supply, classifying this as commensalism.
- This is also **true**. In commensalism, one organism benefits while the other is neither helped nor harmed, which fits the description of epiphytes.

3. **Analyze Option 3**:
- The statement describes the relationship between sea anemone and hermit crab as an example of protocooperation.
- This is **true**. Protocooperation is a type of symbiotic relationship where both organisms benefit but can survive independently. The sea anemone provides protection for the hermit crab, while the crab provides mobility for the anemone.

4. **Analyze Option 4**:
- The statement claims that mutualism, protocooperation, and commensalism cannot be included under symbiosis.
- This is **false**. All three relationships (mutualism, protocooperation, and commensalism) are indeed types of symbiosis, which is a broader term encompassing various forms of interactions between organisms.

### Conclusion:
- Based on the analysis, **Option 4** is the incorrect statement.

### Final Answer:
The incorrect statement is **Option 4**.