CBSE Class 12 Biology Worksheet - Ecology. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
1. In a pond there were 40 lotus plants. After a year the number increased to 56. Calculate birth rate of a lotus plant. 1
2. Why pyramid of energy can never be inverted? 1
3. Why do cattle avoid browsing on Calotropis plants? 1
4. What is Allen’s rule? 1
5. Lichen is considered a good example of obligate mutualism. Explain. 1
6. Distinguish between primary productivity and secondary productivity 2
7. Write the differences between the seral stage and the climax community during succession. 2
8. What measures can be adopted in surroundings to decrease the noise pollution? 2
9. What are the advantages of ‘Ecosan’ ? 2
10. Giving two reasons explain why there is more species biodiversity in tropical latitudes than in temperate ones. 2
11. Mention the major cause of air pollution in metro cities. Write any three ways by which it can be reduced. 2
12. Name the four functional aspects of an ecosystem.
13. What steps have been taken by the Government to reduce pollution in Delhi?
14. What is the condition to dispose off the radioactive waste? 3
15. Describe the process of succession on a bare rock. 3
16. What function do detritivores play in an ecosystem? Explain the significance of humification and mineralization in a decomposition cycle.
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