How does an algal bloom cause eutrophication of a water body? Name the weed that can grow in such a eutrophic lake.

Explanation

**Step-by-Step Solution:**

1. **Understanding Eutrophication**: Eutrophication is defined as the process of nutrient enrichment in a water body, typically due to an increase in nutrients like nitrogen and phosphorus.

2. **Algal Bloom Formation**: The nutrient enrichment leads to excessive growth of algae, known as algal bloom. This occurs because the algae utilize the available nutrients to grow rapidly.

3. **Oxygen Depletion**: As the algal bloom increases, it consumes a significant amount of oxygen in the water during the process of respiration and decomposition. This leads to a decrease in dissolved oxygen levels in the water body.

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