Question

Match the following

List-1	List-II
A. Ozone depletion	1. Radioactive wastes
B. Greenhouse effect	2. Water hyacinth
C. Three mile Island (USA)	3. High concentration of DDT
D. Terror of Bengal	4. Chloroflurucarbons
E. Calcium metabolism in birds	5. CO2 and methane

1. A - 2, B - 4, C - 5, D - 1, E - 3
2. A - 2, B - 3, C - 4, D - 5, E - 1
3. A - 4, B - 1, C - 2, D - 3, E - 5
4. A - 4, B - 5, C - 1, D - 2, E - 3

Answer 1

Correct Answer - Option 4 : A - 4, B - 5, C - 1, D - 2, E - 3

The correct answer is A - 4, B - 5, C - 1, D - 2, E - 3.

•  Ozone Depletion:
  • The ozone layer is the thin shield high up in the sky that stops ultra-violet rays from reaching the earth.
  • As a result of human activities, chemicals, such as chlorofluorocarbons (CFCs) were released into the atmosphere, which contributed to the depletion of the ozone layer.
  • Montreal Protocol of 1989 was on Substances that Deplete the Ozone Layer.
  • September 16 is celebrated as World Ozone Day.
• Greenhouse effect:
  • It is the heating of the earth and its objects because of the trapping of IR radiations by carbon dioxide (CO₂), methane (CH₄), NO, ozone (O₃), chlorofluorocarbons and water vapours.
• Three mile Island (USA):
  • The accident of Three Mile Island (USA) was related to a nuclear disaster where a partial meltdown of reactor number 2 took place at Three Mile Island Nuclear Generating Station in Pennsylvania.
• Terror of Bengal:
  • Water hyacinth is known as the terror of Bengal.
  • It is also known as Eichhornia crassipes.
  • It is powerful in utilizing and consuming aquatic nutrients and solar energy for the purpose of biomass production.
  • This leads to a decline in the number of fishes and leads to the scarcity of fish.
• Calcium metabolism in birds:
  • It is caused due to the high concentration of DDT.