Which of the following increases the amount of `CO_(2)` in atmosphere ?

Options

A. Photosynthesis
B. decay of animals
C. Breathing
D. Burning of coal

Answer

To determine which of the following options increases the amount of CO₂ in the atmosphere, we can analyze each option systematically.

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is the process by which green plants use sunlight to synthesize foods with the help of carbon dioxide (CO₂) and water (H₂O).
- During photosynthesis, plants take in CO₂ and release oxygen (O₂).
- **Conclusion**: Photosynthesis decreases the amount of CO₂ in the atmosphere. Therefore, this option does not increase CO₂ levels.

2. **Decay of Animals**:
- The decay of animals involves the breakdown of organic matter by decomposers, which releases CO₂ back into the atmosphere.
- As animals decay, they undergo respiration and decomposition processes that produce CO₂.
- **Conclusion**: This process increases the amount of CO₂ in the atmosphere.

3. **Breathing**:
- Breathing is the process by which living organisms inhale oxygen (O₂) and exhale carbon dioxide (CO₂).
- Humans and animals inhale O₂ and release CO₂ as a waste product of cellular respiration.
- **Conclusion**: Breathing also contributes to an increase in CO₂ levels in the atmosphere.

4. **Burning of Fossil Fuels**:
- The combustion of fossil fuels (like coal, oil, and natural gas) releases a significant amount of CO₂ into the atmosphere.
- When fossil fuels are burned, they react with oxygen to produce energy, releasing CO₂ as a byproduct.
- **Conclusion**: This process significantly increases the amount of CO₂ in the atmosphere.

### Final Conclusion:
Based on the analysis of each option:
- The processes that increase the amount of CO₂ in the atmosphere are:
- Decay of animals
- Breathing
- Burning of fossil fuels

Thus, the correct answer is that all options except photosynthesis (A) increase the amount of CO₂ in the atmosphere.