Which of the following will be found in polluted water?
ABGA
B. Larvae of stonefly.
C. water hyacinth
D. sewage fungi

Options

A. A,B
B. A,B,C
C. A,C,D
D. A,B,C,D

Answer

To determine which organisms are found in polluted water from the given options, we can analyze each one step by step.

### Step 1: Analyze Option A - BGA (Blue Green Algae)
- Blue Green Algae (BGA) are known to thrive in environments with high nutrient levels, which is typical of polluted water. They can absorb nutrients from the water and often proliferate in such conditions.
- **Conclusion**: BGA is found in polluted water.

### Step 2: Analyze Option B - Larvae of Stonefly
- Stonefly larvae are sensitive to water quality and require clean, fresh water to survive. They are not found in polluted water as they cannot tolerate high levels of pollution.
- **Conclusion**: Larvae of stonefly are NOT found in polluted water.

### Step 3: Analyze Option C - Water Hyacinth
- Water Hyacinth is a floating aquatic plant that often grows in polluted water. It thrives on nutrient-rich water, making it a common sight in such environments.
- **Conclusion**: Water Hyacinth is found in polluted water.

### Step 4: Analyze Option D - Sewage Fungi
- Sewage fungi are organisms that decompose organic matter and are commonly found in polluted water. They thrive on the nutrients available in sewage and other polluted environments.
- **Conclusion**: Sewage fungi are found in polluted water.

### Final Conclusion
Based on the analysis:
- A (BGA), C (Water Hyacinth), and D (Sewage Fungi) are found in polluted water.
- B (Larvae of Stonefly) is not found in polluted water.

Thus, the correct options that will be found in polluted water are A, C, and D.