Give the hazardous effects of agrochemicals.

Explanation

### Step-by-Step Solution:

1. **Introduction to Agrochemicals**:
- Agrochemicals include fertilizers, pesticides, herbicides, and fungicides used in agriculture to enhance crop production and protect against pests.

2. **Effect on Soil Microbial Fauna**:
- Agrochemicals can kill the entire microbial fauna of the soil, including beneficial organisms such as nitrogen-fixing bacteria and cyanobacteria.
- These microorganisms are crucial for maintaining soil fertility as they contribute to nutrient cycling and improve soil structure.
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