Organic farming involves the replacement of chemical fertilizers and pesticides by biofertilizers and blopesticides.

Explanation

**Step-by-Step Solution:**

1. **Understanding Organic Farming**: Organic farming is a method of agriculture that emphasizes the use of natural processes and materials. It avoids synthetic chemicals such as fertilizers and pesticides.

2. **Role of Chemical Fertilizers and Pesticides**: Chemical fertilizers are used to provide essential nutrients to plants, while pesticides are chemicals that control pests that can damage crops. However, these chemicals can have harmful effects on the environment and human health.

3. **Introduction of Biofertilizers**: In organic farming, chemical fertilizers are replaced with biofertilizers. Biofertilizers are natural fertilizers that contain living microorganisms, which help in enhancing the fertility of the soil by fixing nitrogen and promoting nutrient uptake by plants. Examples include Rhizobium and mycorrhizal fungi.

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