As compared to inhaled air, the exhaled air contains more of :
A. water vapour B. oxygen C.carbon dioxide D. nitrogen

Options

A. A and B
B. A and C
C. only c
D. B and C

Answer

**Step-by-Step Solution:**

1. **Understanding Inhaled and Exhaled Air:**
- When we inhale, we take in air that contains a high percentage of oxygen (approximately 21%).
- The air we exhale is different because it has gone through our lungs and has been used by our body.

2. **Composition of Exhaled Air:**
- During respiration, our body utilizes oxygen and produces carbon dioxide as a waste product.
- Additionally, the air we exhale is also warmer and contains more water vapor because of the moisture present in our lungs.

3. **Comparing the Components:**
- Inhaled air has a higher concentration of oxygen and lower concentrations of carbon dioxide and water vapor.
- Exhaled air, on the other hand, has a higher concentration of carbon dioxide and water vapor, while the oxygen level is lower than in inhaled air.

4. **Identifying the Correct Answer:**
- The question asks which component is present in higher amounts in exhaled air compared to inhaled air.
- The options are: A. water vapour, B. oxygen, C. carbon dioxide, D. nitrogen.
- Since exhaled air contains more carbon dioxide and water vapor than inhaled air, the correct answers are A (water vapour) and C (carbon dioxide).
- However, since the question specifies "more of," the best answer is C (carbon dioxide), as it is a significant waste product of respiration.

5. **Final Answer:**
- The correct answer is C. carbon dioxide.