What is the basis of classification of algae?

Explanation

### Step-by-Step Solution:

1. **Understanding Algae**: Algae are autotrophic organisms that can be unicellular or multicellular. They play a significant role in aquatic ecosystems and are classified based on various characteristics.

2. **Basis of Classification**: The classification of algae is primarily based on the following criteria:
- **Pigments**: The type of photosynthetic pigments present in the algae.
- **Stored Food**: The form in which the algae store their food.
- **Cell Wall Composition**: The materials that make up the cell wall of the algae.
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