Why are biofertilisers preferred over chemical fertilisers?

Explanation

**Step-by-Step Solution:**

1. **Definition of Biofertilizers and Chemical Fertilizers:**
- Biofertilizers are substances that contain living microorganisms which enhance the availability of nutrients to plants. They are derived from natural sources and include organisms like bacteria, fungi, and algae.
- Chemical fertilizers, on the other hand, are synthetic products that provide essential nutrients to plants in a concentrated form, typically containing nitrogen, phosphorus, and potassium (NPK).

2. **Safety and Environmental Impact:**
- Biofertilizers are considered safe for the environment as they do not contain harmful chemicals. They are made from natural organisms and materials, which do not pose a risk to human health or the ecosystem.
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