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NCERT - Environmental Issues Questions and Answers of Class 12 Biology | GkSeries

76 Global agreement in specific control strategies to reduce the release of ozone depleting substances, was adopted by
1 The Vienna Convention
2 Rio de Janeiro Conference
3 The Montreal Protocol
4 The Koyoto Protocol

Answer: The Montreal Protocol
77 A chemical harmful released by Chlorofluorocarbon to ozone is
1 Nitrogen Peroxide
2 Fluorine
3 Chlorine
4 Sulphur dioxide

Answer: Chlorine
78 In an area where DDT had been used extensively, the population of birds declined significantly because
1 Cobras were feeding exclusively on birds
2 Many of the birds eggs laid, did not hatch
3 Birds stopped laying eggs
4 Earthworms in the area got eradicated

Answer: Many of the birds eggs laid, did not hatch
79 Greenhouse effect is caused by
1 Green plants
2 Infrared rays
3 UV rays
4 X-rays

Answer: Infrared rays
80 Due to eutrophication______.
1 BOD increases
2 BOD decreases
3 algae are destroyed
4 water becomes less harmful

Answer: BOD increases
81 Minamata disease is due to pollution of
1 Industrial waste mercury into fishing water
2 Oil spill in water
3 Organic waste into drinking water
4 Arsenic into the atmosphere

Answer: Industrial waste mercury into fishing water
82 Measuring Biochemical Oxygen Demand (BOD) is a method used for
1 Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale
2 Working out the efficiency of R.B.Cs. about their capacity to carry oxygen
3 Estimating the amount of organic matter in sewage water
4 Working out the efficiency of oil driven automobile engines

Answer: Estimating the amount of organic matter in sewage water
83 Which of the following pollutions forms Heat island?
1 Water
2 Air
3 Land
4 None of these

Answer: Air
84 dB is a standard abbreviation used for the quantitative expression of
1 The dominant Bacillus in a culture
2 The density of bacteria in a medium
3 A certain pesticide
4 A particular pollutant

Answer: A particular pollutant
85 Among the following, a secondary pollutant is
2 SO2
3 CO
4 Aerosol

Answer: PAN
86 The green house gases, otherwise called radioactively active gases includes
1 Carbon dioxide
2 CH4
3 N2O
4 All of these

Answer: All of these
87 The main atmospheric layer near the surface of earth is
1 troposphere
2 mesophere
3 ionosphere
4 stratospere

Answer: troposphere
88 ______ is the first step of sewage treatment.
1 Precipitation
2 Chlorination
3 Sedimentation
4 Aeration

Answer: Sedimentation
89 Identify the correctly matched pair
1 Basal Convention – Biodiversity Conservation
2 Montreal Protocol - Global warming
3 Kyoto protocol – Climatic change
4 Ramsar Convention – Ground water pollution

Answer: Kyoto protocol – Climatic change
90 CO emitted by automobiles prevents O-transport to body tissues by
1 Changing O2 to CO2
2 Destroying hemoglobin
3 Forming a stable compound with hemoglobin
4 Obstructing the reaction of O2 with hemoglobin

Answer: Forming a stable compound with hemoglobin

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