Question

Select the incorrectly matched pair(s) from the following.

• A. 1 and 3
• B. 2 and 4
• C. 2 and 3
• D. Only 2

Answer 1

The correct option is C 2 and 3

Eutrophication is natural aging of water bodies such as lakes due to the enrichment of the water by nutrients. This causes excessive growth of algae, plants and other aquatic organisms.

Hence, 1 is a correctly matched pair.

Biomagnification is the phenomenon through which certain pollutants (such as DDT) increase in concentration at successive trophic levels along the food chain.

Hence, 2 is an incorrectly matched pair.

The degradation of water quality by any process that changes the temperature of water is called thermal pollution. The main sources of thermal pollution are the thermal and nuclear power plants. These power plants use water as coolant and release hot water into the natural water bodies. The thermal (heated) wastewater eliminates or reduces the number of organisms sensitive to high temperature.

Hence, 3 is an incorrectly matched pair.

An accidental discharge of petroleum products in water bodies is called an oil spill. It will affect marine life.

Hence, 4 is a correctly matched pair.