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1. Man can maintain an ecological balance in the biosphere by –

a) Understanding the balance in the relative number of organisms

b) Deforestation

c) Developing new breeds of domesticated animals and cultivated plants

d) Using pesticides and insecticides

Ans: A

2. In which of the following categories of protected areas in India are local people not allowed to collect and use the biomass?

a) Wildlife Sanctuaries

b) Biosphere Reserves

c) National Parks

d) Wetlands declared under Ramsar Convention

Ans: C

3. Consider the following gases:

Carbon dioxide                      2. Nitrogen Oxides                    3. Sulphur Oxides

Which of the above given is/are the emissions from coal combustion at thermal power plants?

a) 2 only                       b) 1 and 3 only              c) 1 and 2 only              d) 1, 2 and 3

Ans: D

4. What could be the reason for the formation of the ozone hole in the Antarctic?

a) The increased temperature at polar region due to global warming

b) Presence of prominent tropospheric turbulence and inflow of chlorofluorocarbons

c) Presence of prominent polar front and stratospheric Clouds and inflow of chlorofluorocarbons

d) Absence of polar front and stratospheric clouds and inflow of methane and chlorofluorocarbons

Ans: C

5. Which one of the following statements regarding “Carbon credits”, is not correct?

a) Carbon credits are traded at a price fixed from time to time by the United Nations Environment Programme

b) The carbon credit system was ratified in conjunction with the Kyoto Protocol

c) Carbon credits are awarded to countries or groups that have reduced greenhouse gases below their emission quota

d) The goal of the carbon credit system is to limit the increase of carbon dioxide emission

Ans: D

6. Human activities have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of

1. Its escape into the outer stratosphere.

2. The photosynthesis by phytoplankton in the oceans

3. The trapping of air in the polar ice caps

Which of the above-given statements is/are correct?

a) 1 only           b) 3 only                       c) 2 only                       d) 2 and 3 only

Ans: C

7. In the context of ecosystem productivity, marine upwelling zones are important as they increase marine productivity by bringing the

1. Decomposer microorganisms to the surface.                2. Nutrients to the surface.

3. Bottom-dwelling organisms to the surface.

Which of the above-given statements is/are correct?

a) 1 only           b) 3 only    c) 2 only                       d) 2 and 3 only

Ans: C