Question

Which of the following is a natural way of purifying polluted environment ?

• A. Sunlight
• B. Rain
• C. Wind speed
• D. All of these

Hint:

The environment has several self-cleansing mechanisms. Think about how the elements—sun, wind, and rain—can act to break down, dilute, or disperse pollutants naturally.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The question asks for natural processes that help to clean or reduce pollution in the environment.
Step 2: Detailed Explanation:
All the listed natural phenomena play a role in the environment's self-purification processes:
(A) Sunlight: The ultraviolet (UV) radiation in sunlight acts as a natural disinfectant, killing harmful bacteria and viruses. It also drives photochemical reactions that can break down some pollutants.
(B) Rain: Rain can wash away pollutants from the atmosphere (a process called wet deposition) and can also dilute pollutants in rivers and lakes, reducing their concentration.
(C) Wind speed: Wind helps to disperse and dilute air pollutants from a concentrated area, carrying them away and lowering their concentration at the source.
Since all three are natural processes that contribute to purifying the environment, the correct answer is (D).
Step 3: Final Answer:
Sunlight, rain, and wind are all natural ways that help in purifying a polluted environment.