CBSE 12th Standard Biology Subject Environmental Issues Ncert Exemplar 1 Marks Questions With Solution 2021
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CBSE 12th Standard Biology Subject Environmental Issues Ncert Exemplar 1 Marks Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Biology
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Give the expanded from of DDT. Why is it necessary to remove sulphur from petroleum products?
(a)Dichchlorodiphenyl trichloroethane. It reduces emission of sulphur dioxide.
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In the textbox you came across three mile Island Chernbyl disaster associated with accidental lakage of radioactive wasters. In india we had Bhopal gas tragedy.Name the chemical associated with it.
(a)Methyl isocyanate (MIC).
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What is the raw material for polyblend?
(a)Plastic wastes.
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Blends of polyblend and bitumen, when used help to increase the life of roads by a factor of three. What is the reason?
(a)Polyblend echances the water repelling property of bitumen.
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Is it true that if the dissolved oxygen drops to zero, the water will become septic. Give an example which could lower the dissolved oxygen content of an quatic body
(a)Yes, the water will become septic, e.g excess biodegradable (organic) pollutants or eutrophication of water body can cause oxygen depletion.
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Tick (✓) the correct answer :
(i) Approximate percentage of endemic flowering plants in India is : (a) 23 ; (b) 33 ; (c) 53 ; (d) 63.
(ii) The Earth Summit held at Rio de Janerio in 1992 resulted into :
(a) Compilation of Red List ; (b) Establishment of Biosphere Reserves ;
(b) Convention of Biodiversity ; (d) IUCN.(a)(i) (b) ; (ii) (c).
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Which pest attacked the high-yielding varieties of rice a few years ago?
(a)Brown plant hopper (Nilaparvata lugens).
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Cite two examples of Indian endangered species.
(a)Great Indian bustard, Kashmir stag.
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Where is the one-hored rhinoceros preserved?
(a)Kaziranga sanctuary in Assam.
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The term 'alien' species imply to which type of organisms.
(a)Alien species are plants, animals or microorganisms that are transported and established in a new area beyond their natural range.
1 Marks
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CBSE 12th Standard Biology Subject Environmental Issues Ncert Exemplar 1 Marks Questions With Solution 2021 Answer Keys
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Dichchlorodiphenyl trichloroethane. It reduces emission of sulphur dioxide.
-
Methyl isocyanate (MIC).
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Plastic wastes.
-
Polyblend echances the water repelling property of bitumen.
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Yes, the water will become septic, e.g excess biodegradable (organic) pollutants or eutrophication of water body can cause oxygen depletion.
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(i) (b) ; (ii) (c).
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Brown plant hopper (Nilaparvata lugens).
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Great Indian bustard, Kashmir stag.
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Kaziranga sanctuary in Assam.
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Alien species are plants, animals or microorganisms that are transported and established in a new area beyond their natural range.
1 Marks
