What are advantages of biofertilizers over chemical fertilizers. Give an example of biofertilizer.

Explanation

### Step-by-Step Text Solution

1. **Definition of Biofertilizers**:
Biofertilizers are natural fertilizers that consist of living microorganisms which enhance the nutrient quality of the soil. They include various organisms such as bacteria, fungi, and cyanobacteria.

2. **Advantages of Biofertilizers**:
- **Eco-Friendly**: Biofertilizers are derived from natural sources and do not contain harmful chemicals, making them environmentally friendly.
- **Non-Polluting**: Unlike chemical fertilizers, biofertilizers do not contribute to soil and water pollution.
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