During an educational trip, a student of botany saw a beautiful lake in a village. She collected many plants from that area. She notices that villagers were washings clothes around the lake and at some places waste material from houses was destroying its beauty.
After few years, shw visited the same lake again. She was suprised to find that the lake was covered with algae, stinking smell was coming out and its water had become unusable. Can you explain the reason for this condition of the lake ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Eutrophication:**
The condition of the lake can be explained by a process known as eutrophication. Eutrophication occurs when water bodies receive excess nutrients, which leads to an increase in algae growth.

2. **Sources of Nutrients:**
In this case, the nutrients come from domestic waste and detergents that the villagers were disposing of into the lake while washing clothes. These substances contain phosphates and nitrates, which are essential nutrients for algae.

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