Water pollution

Options

A. Increases turbidity and deoxygenation
B. Decreases turbidity
C. Increases oxygenation
D. Increase photosynthesis.

Answer

### Step-by-Step Solution for Water Pollution

1. **Understanding Water Pollution**: Water pollution refers to the contamination of water bodies (like rivers, lakes, oceans) due to harmful substances. It can arise from various sources, including industrial waste, agricultural runoff, and untreated sewage.

2. **Identifying Causes of Water Pollution**: The major contributors to water pollution include:
- Discharge of untreated sewage
- Surface runoff from agricultural fields (which may carry fertilizers and pesticides)
- Industrial waste

3. **Understanding Eutrophication**: The discharge of nutrients (like nitrogen and phosphorus) into water bodies leads to a process called eutrophication. This is characterized by:
- Increased nutrient content in the water
- Explosive growth of algae and plankton, often referred to as algal blooms.

4. **Effects of Eutrophication**: The algal blooms caused by eutrophication have several negative effects:
- **Increased Turbidity**: The growth of algae makes the water murky, which is referred to as increased turbidity.
- **Deoxygenation**: As algae die and decompose, the process consumes dissolved oxygen in the water, leading to a decrease in oxygen levels. This can result in the death of aquatic life due to lack of oxygen.

5. **Analyzing the Options**: Given the options:
- Increases turbidity and deoxygenation
- Decreases turbidity
- Increases oxygenation
- Increases photosynthesis

The correct answer is **increases turbidity and deoxygenation** because of the reasons explained above.

6. **Conclusion**: Water pollution, particularly from untreated sewage and agricultural runoff, leads to increased turbidity and deoxygenation in water bodies, negatively impacting aquatic ecosystems.