A lake with an inflow of domestic sewage rich in organic waste may result in

Options

A. drying of the lake very soon due to algal bloom
B. an increased growth of fishes due to algal bloom
C. death of fish due to lack of oxygen
D. increased population of aquatic food web organisms.

Explanation

### Step-by-Step Solution:

1. **Understanding the Problem**: The question asks about the consequences of a lake receiving domestic sewage that is rich in organic waste.

2. **Identifying the Components**: Domestic sewage contains a high amount of organic matter, which includes nutrients such as nitrogen and phosphorus.

3. **Impact of Nutrients**: The introduction of these nutrients into the lake promotes the growth of aquatic plants and algae, particularly planktonic algae.

4. **Algal Bloom Formation**: The rapid increase in algae due to the excess nutrients is known as an algal bloom. This dense growth can cover the surface of the water.

5. **Oxygen Consumption**: As the algae grow, they consume a significant amount of oxygen in the water, especially when they die and decompose.

6. **Consequences for Aquatic Life**: The depletion of oxygen in the water can lead to hypoxic conditions (low oxygen levels), which are detrimental to fish and other aquatic organisms, potentially resulting in their death.

7. **Conclusion**: Based on the above points, the most likely result of a lake with an inflow of domestic sewage rich in organic waste is the death of fishes due to the lack of oxygen.

### Final Answer:
The correct answer is that a lake with an inflow of domestic sewage rich in organic waste may result in the death of fishes due to the lack of oxygen.

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