Question

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Lakes are less prone to getting polluted than river

Reason R: Water in lakes gets replaced through natural process

In light of the above statements, choose the most appropriate answer from the options given below

1. Both A and R are correct and R is the correct explanation of A
2. Both A and R are correct but R is NOT the correct explanation of A
3. A is correct but R is not correct
4. A is not correct but R is correct

Answer 1

Correct Answer - Option 4 : A is not correct but R is correct

Assertion A: Lakes are less prone to getting polluted than the river

Explanation:

• Lakes often contain high pollution levels relative to the surrounding landscapes and the environment.
• Rivers and streams drain pollutants from the landscape where they concentrate in lakes and other water bodies.
• Aquatic species such as fish can be extremely high in contaminants as some pollutants don’t readily dissolve and dilute in water and are instead taken up into organisms.
• Some species of aquatic organisms are particularly sensitive to pollution; they are used as indicators of pollution and are called bioindicators.
• Because lakes drain a large surrounding landscape, they reflect the processes and actions that operate around them.
• When chemicals are spilled, they can drain into nearby streams and be transported downstream into lakes.

Therefore, the Assertion is not correct.

Reason R: Water in lakes gets replaced through a natural process

Explanation: 

• A lake is a body of water that is surrounded by land. There are millions of lakes in the world. They are found on every continent and in every kind of environment—in mountains and deserts, on plains, and near seashores.
• The water in the lakes comes from rain, snow, melting ice, streams, and groundwater seepage. Most lakes contain freshwater.
• Many lakes form as a result of volcanoes. After a volcano becomes inactive, its crater may fill with rain or melted snow. Sometimes the top of a volcano is blown off or collapses during an eruption, leaving a depression called a caldera. It, too, may fill with rainwater and become a lake.
• Therefore, water in lakes gets replaced through natural processes.

Therefore, Reason (R) is the correct statement.