Select the correct option w.r.t. thermal pollution

Options

A. Speeds up biodegradation of organic matter
B. Death of temperature sensitive organisms
C. It increases rate of metabolism and microbial activity
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Thermal Pollution**:
- Thermal pollution refers to the increase in temperature of water bodies due to human activities, primarily from industrial discharges, power plants, and urban runoff.

2. **Effects on Aquatic Life**:
- The rise in temperature affects aquatic organisms, leading to several negative impacts. One major effect is the increase in the metabolic rate of aquatic animals and plants.

3. **Increased Metabolic Rate**:
- As the temperature rises, the metabolic rate of organisms increases. This means that organisms will consume more food as their enzyme activity is enhanced.

4. **Biodegradation of Organic Matter**:
- With an increased metabolic rate, the speed of biodegradation of organic matter also increases. This means that organic materials are broken down more rapidly in warmer waters.

5. **Impact on Temperature-Sensitive Organisms**:
- Thermal pollution can lead to the death of temperature-sensitive organisms. These organisms cannot survive in higher temperatures, leading to a decline in their populations.

6. **Increased Microbial Activity**:
- Higher temperatures can also increase microbial activity, which can further affect the ecosystem by altering nutrient cycling and the overall health of the aquatic environment.

7. **Conclusion**:
- Based on the effects discussed, all the statements regarding thermal pollution are correct. Therefore, the correct option is **D: All of these**.