Botany - Ecosystem Model Question Paper

12th Standard EM

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Biology

Time : 02:00:00 Hrs
Total Marks : 50
    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. Pond is a type of

    (a)

    forest ecosystem

    (b)

    grassland ecosystem

    (c)

    marine ecosystem

    (d)

    fresh water ecosystem

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

    (a)

    2 – 8%

    (b)

    2 – 10%

    (c)

    3 – 10%

    (d)

    2 – 9%

  4. Ecosystem consists of

    (a)

    decomposers

    (b)

    producers

    (c)

    consumers

    (d)

    all of the above

  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. Cimatic factor

  9. (1)

    Succession initiating on barren rock

  10. Edaphic factor

  11. (2)

    pH of soil

  12. Organic factor

  13. (3)

    humic substances

  14. Lithosere

  15. (4)

    percipitation

  16.  Halosere

  17. (5)

    Succession initiating on saline water

    10 x 2 = 20
  18. Productivity of profundal zone will be low. Why?

  19. Pyramid of energy is always upright. Give reasons

  20. Mention any two climatic factors and edaphic factors of an ecosystem.

  21. Define 'Standing state' with regard to ecosystem.

  22. What are biotic components?

  23. What is standing crop?

  24. Name the category of organisms that occupy the first tropic level (T1) and fourth tropic level (TJ in an ecosystem,

  25. What is energy flow?

  26. Define food chain.

  27. What are Blue carbon ecosystems?

  28. 3 x 3 = 9
  29. Name of the food chain which is generally present in all type of ecosystem. Explain and write their significance.

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

  31. Enumerate the significance of food webs.

  32. 2 x 5 = 10
  33. Describe the various stages of decomposition process.

  34. List the characteristics of ecological succession.

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