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12th Standard Biology English Medium Ecosystem Reduced Syllabus Important Questions 2021

12th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. Which of the following is not a abiotic component of the ecosystem?

    (a)

    Bacteria

    (b)

    Humus

    (c)

    Organic compounds

    (d)

    Inorganic compounds

  2. Which of the following ecosystem has the highest primary productivity?

    (a)

    Pond ecosystem

    (b)

    Lake ecosystem

    (c)

    Grassland ecosystem

    (d)

    Forest ecosystem

  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. Identify the incorrect option among the following component sequence.

    (a)

    air, water, sunlight and temperature

    (b)

    latitude, altitude, direction of mountain and aptitude

    (c)

    soil air, pH of soil, saltwater and soil moisture

    (d)

    carbohydrate, protein, lipids and humic substances

  6. Photosynthetically Active Radiation ranges between the wavelength of __________

    (a)

    400 - 600 nm

    (b)

    600 - 700 nm

    (c)

    400 - 500 nm

    (d)

    400 - 700 nm

  7. Which group of organism occupies the third tropic level in an ecosystem?

    (a)

    Primary consumers

    (b)

    Secondary consumers

    (c)

    Secondary carnivores

    (d)

    Omnivores

  8. 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

  9. Pyramid of numbers with broad base indicates ______

    (a)

    High population of old individuals

    (b)

    Low population of young individuals

    (c)

    High population of young individuals

    (d)

    Low population of old individuals

  10. Spindle shaped pyramid is a character of ______

    (a)

    Pond ecosystem

    (b)

    Grassland ecosystem

    (c)

    Parasite ecosystem

    (d)

    Forest ecosystem

  11. Complete the food chain by filling the link X:
    Paddy ~ Grassopper ~ Frog ~ X ~ Hawk

    (a)

    King cobra

    (b)

    Gorilla

    (c)

    Rabbit

    (d)

    Tasmanial wolf

  12. Which of the following is abundant in rock deposits and guano?

    (a)

    Nitrogen

    (b)

    Phosphorous

    (c)

    Oxygen

    (d)

    Calcium

  13. Lotic ecosystem refers to________

    (a)

    Open water ecosystem

    (b)

    Running water ecosystem

    (c)

    Standing water ecosystem

    (d)

    Ocean water ecosystem

  14. Identify the correct sequence of various zones from surface to depth in a pond ecosystem.

    (a)

    Profundal, limnetic, littoral and benthic

    (b)

    Benthic, littoral, profundal and limnetic

    (c)

    Limnetic, profundal, littoral and benthic

    (d)

    Littoral, limnetic, profundal and benthic

  15. 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

  16. 2 Marks

    10 x 2 = 20
  17. Discuss the gross primary productivity is more efficient than net primary productivity.

  18. Pyramid of energy is always upright. Give reasons

  19. According to A.G. Tansley, what is an ecosystem?

  20. What are biotic components?

  21. Define Grey carbon and Black carbon.

  22. What is energy flow?

  23. What is Eltonian pyramid?

  24. Why do we obtain an inverted pyramid in a parasite ecosystem?

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

  26. Define
    (a) Hydrosere
    (b) Xerosere

  27. 3 Marks

    10 x 3 = 30
  28. Construct the food chain with the following data.
    Hawk, plants, frog, snake, grasshopper.

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

  30. Generally human activities are against to the ecosystem, where as you a student how will you help to protect ecosystem?

  31. State the second law ofthermodynamics.

  32. Explain Grazing food chain with example.

  33. Name the three types of ecological pyramids.

  34. Pyramid of energy is always upright - Justify.

  35. Explain the cycling of phosphorus in an ecosystem.

  36. What is primary succession?

  37. Frame any two food chain patterns from the given organisms. Each chain must contain a minimum of four organisms.
    Diatoms, Hawk, Rabbit, Vallisneria
    Stoke, guppies, grass, snake, large fishes, grasshopper, crane.

  38. 5 Marks

    7 x 5 = 35
  39. 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.

  40. 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.

  41. Describe the various stages of decomposition process.

  42. Give a detailed account of Biotic and abiotic components of a pond ecosystem.

  43. What are the strategies of eco system management?

  44. Differentiate Primary succession and Secondary succession.

  45. What are the significance of plant succession?

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