CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 3 Marks Questions 2021
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CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 3 Marks Questions 2021
12th Standard CBSE
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Reg.No. :
Biology
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Given below are pie diagrams A, B and C related to proportionate number of species of major taxa of invertebrates, vertebrates and plants respectively. Critically study and fill in the blanks (a), (b),(c) and (d).
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(a) What are hot spots of biodiversity?
(b) List four main criteria for determining a particular place as a hot spot.
(c) Among the hot spots of the world, list two which are located in India. -
From among plants, invertebrates and vertebrates, list respectively those taxa which occur maximum in numbers at present.
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The use of incinerators is crucial for the disposal of hospital waste justify.
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Why does deforestation lead to global warming?
3 Marks
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CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 3 Marks Questions 2021 Answer Keys
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(a) Molluscs
(b) Amphibians
(c) Fungi
(d) Angiosperms. -
(a) Hot spots are the regions of rich biodiversity which have been declared sensitive due to direct or indirect interference of human activities
(b) Four main criteria are-
(i) Rich species diversity
(ii) Number of endemic species
(iii) Degree of threat in terms of habitat loss, and
(iv) Degree of exploitation.
(c) Western ghats and Eastern Himalayas. -
Plants - Angiosperms
Invertebrates - Insects
Vertebrates - Fishes. -
Many harmful chemicals, disinfectants and pathogenic microbes are present in the waste generated in the hospitals. Such waste require disposal, requiring incinerators.
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The forest plants fix a lot of CO2 and thus have a lot of carbon in their biomass. The deforestation therefore results in the increased concentration of CO2 in the atmosphere which may result in the global warming.
3 Marks
