CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 1 Marks Questions 2021
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CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 1 Marks Questions 2021
12th Standard CBSE
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Reg.No. :
Biology
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What photochemical oxidant pollute air?
(a)Peroxyl acyl nitrate, ozone and aldehyde.
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Why Western Ghats in India have been declared as biological hot spots?
(a)Western Ghats are biological hot spots because they have high levels of species richness and endemism.
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Regions with high endemism are chosen as hot spots. Why?
(a)Hot spots are the regions with high endemism. The endemic species are mostly rare, and its crucial to conserve them. Hence, the areas with high endemism are chosen as hot spots and given high protection.
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Through auto fuel policy, Euro II norms, the government of india has laid out a road map to cut down the vehicular air pollution in many cities of india.what this norms stipulated?
(a)Euro II norms stipulates that sulphur be controlled at 350 ppm in diesel and 150 ppm in petrol.aromatic hydrocarbons are to be contained at 42 percent of the concerned fuel.according to the road map,is to reduce sulphur to 50ppm in petrol and diesel and bring down the level to 35 percent.
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Why does deforestation lead to loss of biodiversity?
(a)It is due to destruction of habitat of many wild animals.
1 Marks
