In majority of lichens, there is association of

Options

A. Green algae and ascomycetes
B. Green algae and basidiomycetes
C. Blue-green algae and ascomycetes
D. Blue-green algae and basidiomycetes.

Answer

### Step-by-Step Solution:

1. **Understanding Lichens**: Lichens are composite organisms formed by a symbiotic association between fungi and photosynthetic partners. The majority of lichens are formed by a specific type of fungi and a type of algae or cyanobacteria.

2. **Identifying the Fungal Component**: The fungal component of most lichens belongs to the division Ascomycetes. Ascomycetes are a group of fungi that are characterized by the production of spores in a sac-like structure called an ascus.

3. **Identifying the Photosynthetic Partner**: The photosynthetic partner in lichens can be either green algae or cyanobacteria (blue-green algae). However, in the majority of lichens, the association is primarily with cyanobacteria.

4. **Mutualistic Relationship**: In this association, both organisms benefit. The fungus provides a protective environment and absorbs moisture and nutrients from the surroundings, while the photosynthetic partner (cyanobacteria) produces food through photosynthesis.

5. **Evaluating the Options**:
- Green algae and Ascomycetes
- Green algae and Basidiomycetes
- Blue-green algae and Ascomycetes (correct answer)
- Blue-green algae and Basidiomycetes

Among these options, the correct association in the majority of lichens is between blue-green algae and Ascomycetes.

6. **Conclusion**: Therefore, the correct answer to the question is that in the majority of lichens, there is an association of blue-green algae and Ascomycetes.