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

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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Environmental Issues of Biology.
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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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