Which of the following process does not increase the amount of `CO_(2)` in atmosphere?

Options

A. Decay of animals
B. Breathing
C. Photosynthesis
D. Burning of petrol.

Answer

To determine which process does not increase the amount of CO₂ in the atmosphere, let's analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is a process carried out by plants where they absorb carbon dioxide (CO₂) from the atmosphere.
- The general equation for photosynthesis is:
\[ 6 \text{CO}_2 + 6 \text{H}_2\text{O} \xrightarrow{\text{sunlight}} \text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \]
- In this process, carbon dioxide is consumed to produce glucose (C₆H₁₂O₆) and oxygen (O₂). Therefore, photosynthesis does not increase the amount of CO₂ in the atmosphere.

2. **Decay of Animals**:
- The decay of animals involves the breakdown of organic matter, which requires oxygen and results in the release of carbon dioxide.
- During decomposition, organic compounds react with oxygen to produce CO₂, thus increasing its concentration in the atmosphere.

3. **Breathing**:
- Breathing is a biological process where organisms inhale oxygen and exhale carbon dioxide.
- The exhalation of CO₂ contributes to an increase in its concentration in the atmosphere.

4. **Burning of Petrol**:
- The burning of petrol (combustion) involves the reaction of hydrocarbons with oxygen, producing carbon dioxide and water.
- This process also results in an increase in CO₂ levels in the atmosphere.

### Conclusion:
Based on the analysis, the only process that does not increase the amount of CO₂ in the atmosphere is **photosynthesis**.

### Final Answer:
**Photosynthesis** does not increase the amount of CO₂ in the atmosphere.

---