Combined Defence Services Exam-2012

(Combined Defence Services Exam-2012)
(Held on 12-2-2012)
(General Knowledge)

1. Over 90% of the World’s biomass is in—
A. Tropical rain forests
B. Freshwater wetlands
C. Topsoils
D. Oceans

2. Which one among the following is a source of methane emission into the atmosphere?
A. Automobile exhaust fume
B. Industrial chimney
C. Mining
D. Wetland

3. Which one among the following statements is not correct?
A. Trophic dynamics represents the transfer of energy from one trophic level to another in a food chain
B. In deeper parts of oceans, primary production remains almost nil
C. The primary consumers are called autotrophs
D. The decomposers are called saprotrophs

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4. Carbon dioxide is called green-house gas because—
A. Its concentration remains always higher than other gases
B. It is used in photosynthesis
C. It absorbs infrared radiation
D. It emits visible radiation

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