There exists a close associatin between the algae and the fungus within a lichen. The fungus

Options

A. Provides protection, anchorage and absorption for the algae
B. Provides food for the alga
C. Fixes the atmospheric nitrogen for the alga
D. Releases oxygen for the alga

Answer

**Step-by-Step Solution:**

1. **Understanding Lichens**: Lichens are a symbiotic association between fungi and algae. This means that they live together in a close relationship where both organisms benefit from each other.

2. **Role of Algae**: In this relationship, algae are photosynthetic organisms. They use sunlight to produce food through photosynthesis, which they share with the fungus.

3. **Role of Fungus**: The fungus, on the other hand, provides several benefits to the algae. It offers protection from environmental factors and helps anchor the algae to a surface. Additionally, the fungus absorbs water and nutrients from the environment, which can be shared with the algae.

4. **Mutualism**: The relationship between the algae and fungus in lichens is a type of mutualism, where both organisms benefit. The fungus receives food from the algae, while the algae receive protection and nutrients from the fungus.

5. **Evaluating the Options**: The question provides several options regarding the role of the fungus in this association:
- **Option 1**: The fungus provides protection and encourages absorption for the algae. This is true.
- **Option 2**: The fungus provides food for the algae. This is incorrect because fungi do not perform photosynthesis.
- **Option 3**: The fungus fixes atmospheric nitrogen for the algae. This is incorrect as fungi do not have the necessary enzymes for nitrogen fixation.
- **Option 4**: The fungus releases oxygen for the algae. This is also incorrect since fungi do not photosynthesize.

6. **Conclusion**: Based on the evaluation of the options, the correct answer is that the fungus provides protection and encourages absorption for the algae.

**Final Answer**: The fungus provides protection and encourages absorption for the algae (Option 1).

---