Environment  Bio Diversity

51. What happen if phytoplankton of an ocean is completely destroyed for some reason?
A. The ocean as a carbon sink would be adversely affected
B. The food chain in the ocean would be adversely affected
C. The density of ocean water would drastically increase.
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A and B only B and C only A,B and C None
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52. What is the role of UV Radiation in water purification systems?

It inactivates the harmful microorganisms in water It activates the harmful microorganisms in water It gives pure water by removing dust particles All the above
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53. Chlorofluorocarbons known as ozone-depleting substances are used in which of the following?
A. Production of plastic foams
B. In cleaning certain electronic components
C. As pressurizing agents in aerosol coins.
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A and B only B and C only A,B and C None
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54. What is the importance of Sea Buckthorn?
A. Helps in controlling soil erosion and in preventing desertification
B. Has nutritional value and is well-adapted to live in cold areas of high altitudes
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A only B only Both A and B Neither A nor B
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55. Which of the following are found as pollutant in the drinking water in some parts of India?

Arsenic Fluoride Uranium All the above
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56. In the grassland tress do not replace the grasses as a part of an ecological Succession. What is the reason behind it?

Water limits Fire Both A and B None of the above
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57. acid rain is caused by the pollution of environment by?
A. Nitrous oxide
B. Sulphur dioxide
C. Hydrogen
D. carbon
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A and B only A, B and C only A,B and C A, B, C, and D
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58. What is Nostoc?

Used as bio-fertilizer Used as chemicals Used in purification process Used in Absorption process
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59. Photochemical smog is a resultant of the reaction among?

NO2, O3 , Peroxyacetyl nitrate in presence of sunlight O3 , Peroxyacetyl nitrate in presence of sunlight H2 , CH4, Peroxyacetyl nitrate in presence of sunlight H2 , CH4, NO2 in presence of sunlight
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60. In food chain what are all decomposer organisms?
A. fungi
B. bacteria
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A only B only Both A and B Neither A nor B
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