Botany - Ecosystem Model Question Paper

12th Standard EM

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Biology

Time : 01:30:00 Hrs
Total Marks : 40
    6 x 1 = 6
  1. Which of the following is not a abiotic component of the ecosystem?

    (a)

    Bacteria

    (b)

    Humus

    (c)

    Organic compounds

    (d)

    Inorganic compounds

  2. Solar energy used by green plants for photosynthesis is only

    (a)

    2 – 8%

    (b)

    2 – 10%

    (c)

    3 – 10%

    (d)

    2 – 9%

  3. Ecosystem consists of

    (a)

    decomposers

    (b)

    producers

    (c)

    consumers

    (d)

    all of the above

  4. Significance of food web is / are

    (a)

    it does not maintain stability in nature

    (b)

    it shows patterns of energy transfer

    (c)

    it explains species interaction

    (d)

    b and c

  5. Which of the following is / are not the mechanism of decomposition

    (a)

    Eluviation

    (b)

    Catabolism

    (c)

    Anabolism

    (d)

    fragmentation 

  6. Which of the following is not a sedimentary cycle

    (a)

    Nitrogen cycle

    (b)

    Phosphorous cycle

    (c)

    Sulphur cycle

    (d)

    Calcium cycle

  7. 5 x 1 = 5
  8. Topographic factor

  9. (1)

    Succession initiating on barren rock

  10. Organic factor

  11. (2)

    Succession initiating on saline water

  12. Lithosere

  13. (3)

    Altitude

  14.  Halosere

  15. (4)

    humic substances

  16.  Xerosere

  17. (5)

    Succession initiating on desert area

    5 x 2 = 10
  18. Productivity of profundal zone will be low. Why?

  19. Pyramid of energy is always upright. Give reasons

  20. What are biotic components?

  21. What is standing crop?

  22. What is energy flow?

  23. 3 x 3 = 9
  24. Construct the food chain with the following data.
    Hawk, plants, frog, snake, grasshopper.

  25. Shape of pyramid in a particular ecosystem is always different in shape. Explain with example.

  26. List the factors affecting primary productivity.

  27. 2 x 5 = 10
  28. Draw a pyramid from following details and explain in brief.
    Quantities of organisms are given-Hawks-50, plants-1000.rabbit and mouse-250 +250, pythons and lizard- 100 + 50 respectively.

  29. Describe the various stages of decomposition process.

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