Match List - I with List - II.

Choose the correct answer from the options given below:

A-III, B-II, C-I, D-IV

The correct answer is Option (3) -A-III, B-II, C-I, D-IV

DDT A few toxic substances, often present in industrial waste waters, can undergo biological magnification (Biomagnification) in the aquatic food chain. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well- known for mercury and DDT

Nuclear energy can be used to generate electricity, but it also produces radioactive waste that can damage the environment and human health.Radiation, that is given off by nuclear waste is extremely damaging to organisms, because it causes mutations at a very high rate.

Accelerated eutrophication is the overgrowth of algae and plants in lakes and other bodies of water. This can be caused by an excess of nutrients, such as nitrogen and phosphorus, from agricultural runoff and sewage. Eutrophication can lead to a decrease in oxygen levels in the water, which can kill fish and other aquatic life. Eutrophication is the natural aging of a lake by nutrient enrichment of its water. In a young lake the water is cold and clear, supporting little life.

Thermal power plants: Heated (thermal) wastewater flowing out of electricity-generating units, e.g., thermal power plants, constitute another important category of pollutants. Thermal wastewater eliminates or reduces the number of organisms sensitive to high temperature, and may enhance the growth of plants and fish in extremely cold areas but, only after causing damage to the indigenous flora and fauna.