In a village in Karnatka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers. Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.

Explanation

### Step-by-Step Solution:

1. **Introduction to the Situation**:
- In a village in Karnataka, farmers cultivated crops around a lake and added fertilizers to enhance crop yield.

2. **Impact of Fertilizers**:
- The fertilizers used by the farmers contained high levels of nitrates and phosphates.
- During rainfall or through underground seepage, these fertilizers washed into the lake, enriching the water body with nutrients.
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