The spilling of oil on the surface of oceans and seas is known as oil spill. Which of the following changes is not a consequence of an oil spill?

Options

A. Reduction in the amount of sunlight obtained
B. Increase in the concentration of toxins in water
C. Increase in the population of marine organisms
D. Reduction in the amount of dissolved oxygen in water

Answer

To determine which of the following changes is not a consequence of an oil spill, we need to analyze the options provided in relation to the effects of oil spills on marine environments.

### Step-by-Step Solution:

1. **Understanding Oil Spills**:
- An oil spill occurs when oil is accidentally released into the ocean or seas, creating a layer on the surface of the water.

2. **Consequences of Oil Spills**:
- **Reduction in Sunlight**: The oil layer on the water surface blocks sunlight from penetrating into the water, which can harm photosynthetic organisms like phytoplankton.
- **Increase in Toxic Concentration**: Oil spills introduce toxic substances into the water, increasing the concentration of harmful chemicals that can affect marine life.
- **Reduction in Dissolved Oxygen**: The presence of oil can decrease the amount of dissolved oxygen in the water, which is essential for the survival of aquatic organisms.

3. **Evaluating the Options**:
- **Option A**: Reduction in the amount of sunlight obtained - This is a consequence of oil spills.
- **Option B**: Increase in the concentration of toxic substances in water - This is also a consequence of oil spills.
- **Option C**: Increase in the population of marine organisms - This is NOT a consequence of oil spills; in fact, oil spills typically harm marine life and can lead to a decrease in their populations.
- **Option D**: Reduction in the amount of dissolved oxygen in water - This is a consequence of oil spills.

4. **Conclusion**:
- The correct answer is **Option C: Increase in the population of marine organisms**. This change is not a consequence of an oil spill.