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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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(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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