What are biofertilisers? Give two examples.

Explanation

**Step-by-Step Text Solution:**

**Step 1: Define Biofertilisers**
Biofertilisers are biological organisms that enhance the nutrient quality of the soil. They play a crucial role in enriching the soil by adding essential nutrients that are beneficial for plant growth.

**Step 2: Identify the Sources of Biofertilisers**
The primary sources of biofertilisers include:
- Bacteria
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