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

Questions
16 We and our surroundings together are called...
1 environment
2 atmosphere
3 lithosphere
4 hydrosphere

Answer: environment
17 Which of the following is not an environmental problem ?
1 Wastage of water
2 Conservation of water
3 Deforestation
4 Land erosion

Answer: Conservation of water
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18 Volcano is ______ source of pollution.
1 artificial
2 natural
3 both
4 man-made

Answer: natural
19 A disease affecting industrial workers is
1 Silicosis
2 Fluorosis
3 Asthma
4 None of these

Answer: Silicosis
20 The slow rate of decomposition of fallen logs in nature is due to their:
1 Poor nitrogen content
2 Low moisture content
3 Low cellulose content
4 Anaerobic environment around them

Answer: Poor nitrogen content
21 BOD is connected with
1 Microbes
2 Organic matter
3 Microbes and organic matter
4 None of these

Answer: Microbes and organic matter
22 Sulphur dioxide affects
1 All membrane systems
2 Plasmodesmata
3 Cell wall
4 Nucleus

Answer: All membrane systems
23 Decomposition of domestic wastes under natural processes is called
1 Industrial pollution
2 Thermal pollution
3 Biodegradable pollution
4 Nonbiodegradable pollution

Answer: Biodegradable pollution
24 Ozone hole is largest over
1 Antarctica
2 Europe
3 Africa
4 China

Answer: Antarctica
24 The major pollutant from automoblie exhaust is
1 NO
2 CO
3 SO2
4 Soot

Answer: CO
26 Which one of the following is not a bioindicator of water pollution?
1 Blood-worms
2 Sludge-worms
3 Sewage fungus
4 Stone flies

Answer: Stone flies
27 Which of the following pollutants is discharged by jet planes?
1 Photo-chemical oxidants
2 Fog
3 Smog
4 Aerosols

Answer: Aerosols
28 Lichens indicate pollution by
1 Ozone
2 SO2
3 NO3
4 CO

Answer: SO2
29 Photochemical smog results problems in
1 vegetation
2 animals
3 building materials
4 all of these

Answer: all of these
30 Chronic exposure to arsenic causes
1 skeletal flororosis
2 black foot disease
3 itai itai disease
4 blue baby syndrome

Answer: black foot disease
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