Which gas in the atmosphere traps the heat rays reflected by the earth ?

Options

A. Carbondioxide
B. Carbonmonooxide
C. Oxygen
D. Nitrogen

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which gas in the atmosphere is responsible for trapping heat rays that are reflected by the Earth. This is related to the greenhouse effect.

2. **Identifying the Options**: The options provided are:
- A) Carbon dioxide
- B) Carbon monoxide
- C) Oxygen
- D) Nitrogen

3. **Analyzing Each Option**:
- **Carbon Dioxide**: This gas is known for its role in the greenhouse effect. It traps heat rays reflected from the Earth, contributing to an increase in temperature.
- **Carbon Monoxide**: While it is a pollutant, it does not significantly contribute to the greenhouse effect.
- **Oxygen**: This gas is essential for life but does not trap heat rays.
- **Nitrogen**: This is the most abundant gas in the atmosphere but does not have a role in trapping heat.

4. **Conclusion**: Based on the analysis, the gas that traps heat rays reflected by the Earth is carbon dioxide.

5. **Final Answer**: The correct answer is **A) Carbon dioxide**.

---