Correct Option
The correct option is 2 and 3 only
Explanation
Air is a mixture of various gases, water vapor, and particulate matter. Each component plays a specific role in the environment and biological processes.
Statement-wise Analysis
- Pair 1 is Incorrect: Nitrogen does not support burning. It is Oxygen that supports combustion. Nitrogen acts as a diluent, preventing rapid and uncontrollable burning.
- Pair 2 is Correct: Oxygen is essential for respiration in most living organisms. It is also the primary supporter of combustion.
- Pair 3 is Correct: Smoke is a byproduct of combustion, consisting of a mixture of gases and fine dust particles. It is often harmful to health and the environment.
- Pair 4 is Incorrect: The fine hair and mucus present inside the nose act as filters to trap dust particles and impurities, preventing them from entering the respiratory system. They do not filter oxygen from the air.
Key Takeaway: Oxygen is the supporter of combustion and essential for respiration, whereas Nitrogen is non-combustible. Nasal hairs serve as a physical barrier against particulate matter.