Lichen depicts

Options

A. Parasitism between alga and fungus
B. Parasitism between protist and bryophyte
C. Symbiosis between alga and fungus
D. Symbiosis between alga and gymnosperm

Answer

### Step-by-Step Solution:

1. **Understanding Lichens**: Lichens are composite organisms formed from a symbiotic relationship between fungi and photosynthetic partners, which can be algae or cyanobacteria.

2. **Identifying the Components**: In lichens, the fungal component provides structure and protection, while the algal or cyanobacterial component is responsible for photosynthesis, producing food.

3. **Nature of the Relationship**: The relationship between the fungus and the algae/cyanobacteria is symbiotic. This means both organisms benefit from the association: the fungus gains food from the photosynthetic activity of the algae, while the algae receive protection and moisture from the fungus.

4. **Analyzing the Options**: The question provides several options regarding the nature of the relationship depicted by lichens:
- Parasitism between alga and fungus
- Parasitism between protist and bryophyte
- Symbiosis between alga and fungus
- Symbiosis between alga and gymnosperm

5. **Choosing the Correct Option**: Since lichens represent a mutualistic relationship where both organisms benefit, the correct answer is "symbiosis between alga and fungus."

### Final Answer:
Lichen depicts **symbiosis between alga and fungus**.

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