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Botany - Ecosystem Practice Question Paper

12th Standard EM

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Biology

Time : 01:00:00 Hrs
Total Marks : 40
    9 x 1 = 9
  1. Which of the following is / are not a natural ecosystem?

    (a)

    Forest ecosystem

    (b)

    Rice field

    (c)

    Grassland ecosystem

    (d)

    Desert ecosystem

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

    (a)

    2 – 8%

    (b)

    2 – 10%

    (c)

    3 – 10%

    (d)

    2 – 9%

  3. The following diagram represents

     

    (a)

    pyramid of number in a grassland
    ecosystem

    (b)

    pyramid of number in a grassland ecosystem

    (c)

    pyramid of number in a pond ecosystem

    (d)

    pyramid of biomass in a pond ecosystem

  4. Which of the following are not regulating services of ecosystem services
    i) Genetic resources
    ii) Recreation and aesthetic values
    iii) Invasion resistance
    iv) Climatic regulation

    (a)

    i and iii 

    (b)

     ii and iv

    (c)

    i and ii

    (d)

    i and iv

  5. Pick out the edaphic factor among the following.

    (a)

    Rain fall

    (b)

    Temperature

    (c)

    Soil pH

    (d)

    Latitude

  6. If 1200 Joules of solar energy is trapped by producers, how much of Joules of energy does the organism in the third trophic level will receive?

    (a)

    120 Joules

    (b)

    12 Joules

    (c)

    1.2 Joules

    (d)

    0.12 Joules

  7. The bottom most zone of a pond is termed as .

    (a)

    Limnetic zone

    (b)

    Littoral zone

    (c)

    Benthic zone

    (d)

    Profundal zone

  8. Assertion (A): Pyramid of energy is upright.
    Reason (R): During the energy transfer at successive trophic levels from producers there will be a gradual decrease

    (a)

    Both A and R are wrong

    (b)

    A is right R is wrong

    (c)

    R explains A

    (d)

    A is right R is not the correct explanation for A

  9. _________is the climax community of hydro sere.

    (a)

    Reed swamp stage

    (b)

    Marsh medow stage

    (c)

    Shrub stage

    (d)

    Forest stage

  10. 1 x 1 = 1
  11. Who coined the term Ecosystem?

    ()

    A.G. Tansley

  12. 4 x 2 = 8
  13. Discuss the gross primary productivity is more efficient than net primary productivity.

  14. Name the macro consumers and micro consumers.

  15. Write the name of four important aspects of ecosystem.

  16. Name the type of ecosystem that exhibits the following types of pyramid.
    (a) Inverted pyramid of biomass
    (b) Spindle shaped pyramid of number

  17. 4 x 3 = 12
  18. Shape of pyramid in a particular ecosystem is always different in shape. Explain with example.

  19. Give an account on the concept of trophic level in an ecosystem.

  20. Spindle shaped pyramid of number is noticed in forest ecosystem. Give reasons.

  21. According to ten percent law, how many Joules of energy does the individuals at the fourth tropic level will receive; ifthe individuals at first trophic level receives 1000 Joules of energy?

  22. 2 x 5 = 10
  23. Various stages of succession are given bellow. From that rearrange them accordingly. Find out the type of succession and explain in detail.
    Reed-swamp stage, phytoplankton stage, shrub stage, submerged plant stage, forest stage, submerged free floating stage, marsh medow stage.

  24. Differentiate Primary succession and Secondary succession.

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