CBSE 12th Standard Biology Subject Environmental Issues Ncert Exemplar 3 Marks Questions 2021
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CBSE 12th Standard Biology Subject Environmental Issues Ncert Exemplar 3 Marks Questions 2021
12th Standard CBSE
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Reg.No. :
Biology
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Human benefits from diversity of life. Give two examples.
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Since the origin of life on earth, there were five episodes of mass extinction of species.
(i) How is the 'Sixth Extinction', presently n progress, different from the previous episodes?
(ii) Who is mainly responsible for the 'Sixth Extinction'?
(iii) Lis any four points that can help to overcome this disaster. -
Write a note on cultural and religious importance of biodiversity.
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Express your opinion on removal of tribal people out of forest due to developmental activities in the forest.
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The following graph shows the species-area relationship. Answer the following question as directed.
(i) Name the naturalist who studied the kind of relationship shown in the graph. Write the observation made by him.
(ii) Write the situations as discovered by the ecologist when the value of Z (*slope of the line) lies between (a) 0.1 and 0.2 (b) 0.6 and 1.2. What does Z stand for?
(iii) When would the slope of the line 'B' become steeper? -
Can you think a situation where we deliberately want to make a species extinct? How would you justify it?
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Many plant and animal species are on the verge of their extinction because of loss of forest land by indiscriminate use by the humans. As a biology students what method would you suggest along with its advantages that can protect such threatened species from getting extinct?
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Though the conflict between humans and wildlife started with the evolution of man, the intensity of conflict has increased due to the activities of modern man. Justify your answer with suitable examples.
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Though the conflict between humans and wildlife started with the evolution of man, the intensity of conflict has increased due to the activities of modern man. Justify your answer with suitable examples.
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Though the conflict between humans and wildlife started with the evolution of man, the intensity of conflict has increased due to the activities of modern man. Justify your answer with suitable examples.
3 Marks
