Question

The components of air which are harmful to live beings are

• A. nitrogen and carbon dioxide
• B. dust and water vapour
• C. dust and smoke
• D. smoke and water vapour

Answer 1

The correct option is C

dust and smoke

The correct option is C:

Explanation for the correct option:

1. Dust and fumes make breathing difficult.
2. It causes injuries to our lungs.
3. Smoke and dust also cause cardiovascular health problems.
4. Tiny particles and gases in the smoke can cause inflammation in the eyes and lungs, which can lead to runny nose, bronchitis, or eye irritation.
5. Exposure to high concentrations of these particles can cause persistent coughing, coughing, wheezing, and difficulty breathing.

Explanation for the incorrect option:

Option A:

1. Plants need nitrogen.
2. Carbon dioxide is an essential component of photosynthesis.

Option B:

1. Water vapor and dust particles are important components of weather and climate.
2. In addition, they affect the stability of the atmosphere.

Option D:

1. Smoke consists of air and soot.
2. Gases usually consist of water vapor, but smoke differs from vapors that contain other gases.

Final answer: The components of air that are harmful to live beings are dust and smoke.