CBSE Class 12 Biology Ecosystem (2). 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.
ONE MARK QUESTION
1 Differentiate between a detritivore and a decomposer giving an example of each.
2 Expand PAR
3 Define climax community.
4 Identify the pioneer species of xerarch and hydrarch succession.
TWO MARK QUESTIONS
5 List the steps involved in decomposition process.
6 What I ecological succession? Write different stages of xerarch succession.
7 hat is primary productivity? How is it different from Net Primary Productivity.
9 Name the pioneer and the climax species in a water body. Mention the changes observed in the biomass and the biodiversity of the successive seral communities developing in the water body.
3 MARK QUESTIONS
10 Name the pioneer species on a barren rock. How do they help in establishing the next type of vegetation? Mention the type of climax community that will ultimately get established?
11 Construct an ideal pyramid of energy when 1,00,000 joules of sunlight is available. Label all its trophic levels.
12 Construct a pyramid of biomass starting with phytoplanktons. Label 3 trophic levels. Is the pyramid upright or inverted? Why?
13 Draw and complete the following model of carbon cycle filling a, b, c, d, e and
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