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

Questions
46 Which of the following is responsible for acid rain ?
1 Hydrogen
2 Oxygen
3 Sulphur dioxide
4 Methane

Answer: Hydrogen
47 Which of the following don't settle in still air
1 water drops
2 sand particles
3 cigarette smoke
4 all of above

Answer: cigarette smoke

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48 Phosphate pollution is brought about by
1 Phosphate rocks
2 Fertilizers
3 Phosphate rocks and sewage
4 Fertilizers and sewage

Answer: Fertilizers and sewage
49 Eutrophication is often seen in
1 Mountains
2 Deserts
3 Fresh water lakes
4 Ocean

Answer: Fresh water lakes
50 Carbon monoxide is a pollutant because it
1 Reacts with O2
2 Reacts with hemoglobin
3 Inhibits glycolysis
4 Inactivates nervous system

Answer: Reacts with hemoglobin
51 Acid rain is caused by increase in the atmospheric concentration of
1 Ozone and dust
2 SO2 and NO2
3 SO3 and CO
4 CO2 and CO

Answer: SO2 and NO2
52 Pipelines break and oil seeps into the ground, causing
1 Land pollution
2 Oil spillage
3 water Pollution
4 Air Pollution

Answer: Land pollution
53 Sound becomes a hazardous noise pollution if its level is above
1 30 dB
2 80 dB
3 120 dB
4 125 dB

Answer: 80 dB
54 Which pollutants are responsible for bronchitis ?
1 O2, CO2
2 CO, CO2
3 SO2, NO2
4 Cl2, H2S

Answer: SO2, NO2
55 Fish die in water polluted by sewage due to
1 Pathogens
2 Reduction in O2
3 Clogging of gills by silt
4 Foul smell

Answer: Reduction in O2
56 Which of the following shows biological amplification?
1 Hg
2 Cd
3 Both (1) and (2)
4 Neither (1) nor (2)

Answer: Both (1) and (2)
57 Acid rain is caused by
1 ozone
2 oxides of nitrogen
3 oxides of carbon
4 oxides of sulphur

Answer: oxides of sulphur
58 Ultra-violet light causes
1 Photodynamic action
2 Sticky metaphases
3 Formation of pyrimidines
4 Destruction of hydrogen bonds between complementary DNA strands

Answer: Destruction of hydrogen bonds between complementary DNA strands
59 Maximum deposition of DDT will occur in
1 Phytoplankton
2 Crab
3 Eel
4 Sea gull

Answer: Sea gull
60 The ultraviolet radiations in the stratosphere are absorbed by
1 SO2
2 Oxygen
3 Ozone
4 Argon

Answer: Ozone

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