A water body characterized by nutrient rich water supports abundant growth of phytoplanktons and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less.
Eutrophicated water usually looks turbid green in colour because of

Options

A. Excessive growth of phytoplanktons
B. Accumulation of minerals and nutrients
C. Water body becoming polluted
D. Release of degraded plant chlorophyll in water

Explanation

**Step-by-Step Solution:**

1. **Understanding Eutrophication**: Eutrophication is a process that occurs in water bodies when there is an excessive growth of plants, particularly phytoplankton, due to high nutrient levels, especially nitrogen and phosphorus.

2. **Characteristics of Eutrophicated Water**: In eutrophicated water bodies, the water becomes rich in nutrients, leading to an abundant growth of phytoplankton. This growth often results in a dense layer of algae on the surface.

3. **Visual Appearance**: The presence of a large number of phytoplankton and algae gives the water a turbid (cloudy) appearance. The water typically appears green due to the chlorophyll pigment found in these organisms.

4. **Dissolved Oxygen Content**: As the phytoplankton grow and eventually die, their decomposition consumes a significant amount of dissolved oxygen in the water, leading to very low or nil oxygen levels.

5. **Conclusion**: Therefore, eutrophicated water looks turbid green in color primarily because of the excessive growth of phytoplankton, which contain chlorophyll, giving the water its green hue.

**Final Answer**: Eutrophicated water usually looks turbid green in color because of the excessive growth of phytoplankton.

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