In a certain town, a factory discharges its chemical waste directly into a small lake. The Yeaus water in this lake is then used by farmers for irrigation purpose. Which of the following changes will not be noted in this town?

Options

A. The quality of the water in the lake will decrease.
B. The marine life in the lake will get seriously affected.
C. The people living nearby will suffer from water borne diseases.
D. The fertility of the lands irrigated by the lake water will increase.

Answer

To solve the question, we need to analyze the effects of the factory discharging chemical waste into the lake and how it impacts the surrounding environment, particularly focusing on the changes that will occur in the town.

### Step-by-Step Solution:

1. **Identify the Source of Pollution**:
- A factory is discharging chemical waste directly into a small lake. This introduces toxins and harmful substances into the water.

2. **Assess the Impact on Water Quality**:
- The quality of water in the lake will decrease due to the presence of chemicals. This is a direct consequence of pollution, leading to water degradation.

3. **Evaluate Effects on Marine Life**:
- The aquatic life in the lake will be seriously affected. The introduction of toxins can reduce the dissolved oxygen levels, making it difficult for fish and other aquatic organisms to survive.

4. **Consider Human Health Implications**:
- People living nearby will likely suffer from waterborne diseases. The polluted water can contain pathogens that pose health risks to the community.

5. **Analyze the Impact on Agriculture**:
- Farmers use the lake water for irrigation. However, the presence of toxins in the water will not enhance soil fertility; instead, it will likely decrease it. The chemicals can harm the soil structure and reduce its nutrient content.

6. **Identify the Statement that Will Not Be Noted**:
- Among the options provided, the statement that the fertility of the land irrigated by the lake water will increase is incorrect. This change will not be noted in the town because the opposite effect (decrease in fertility) is expected due to pollution.

### Conclusion:
The correct answer is that the fertility of the land irrigated by the lake water will **not** increase.

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