Question

Which of the following is a natural way of purification of polluted air?

• A. Sunlight
• B. Rain
• C. Trees and plants
• D. All of these

Hint:

Nature has its own cleaning systems. Think about how the air often feels fresh and clean after a good rain shower—that's a direct example of natural air purification.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The question asks to identify natural processes that help to clean or purify the air from pollutants.

Step 2: Detailed Explanation:
- Sunlight: Ultraviolet (UV) radiation from the sun can break down some pollutant molecules in the atmosphere through a process called photolysis.
- Rain: Rain can wash away particulate matter and dissolve gaseous pollutants from the air, bringing them down to the ground. This process is known as wet deposition.
- Trees and plants: Through photosynthesis, plants absorb carbon dioxide. Their leaves also trap particulate matter and can absorb certain gaseous pollutants.
All three are natural mechanisms that contribute to the purification of air.

Step 3: Final Answer:
Sunlight, rain, and trees and plants are all natural ways of purifying polluted air.