Environmental Science Model Question Paper

9th Standard

    Reg.No. :
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Science

Time : 02:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The ice sheets from the north and south poles and the icecaps on the mountains, get converted into water vapour through the process of ______________.

    (a)

    evaporation

    (b)

    condensation

    (c)

    sublimation

    (d)

    infiltration

  2. In some xerophytes, leaves are modified into spines as an adaptation ________________.

    (a)

    to reduce transpiration rate

    (b)

    to store water

    (c)

    to reduce consumption of water

    (d)

    all of the above

  3. Which of the following is one of the strategies to conserve water?

    (a)

    Water recycling

    (b)

    Increasing the number of bore wells

    (c)

    Using large overhead water tanks

    (d)

    Watering the plants using hose

  4. Specific constituents such as nitrogen, phosphorus, suspended solids and heavy metals found in the wastewater are removed during ___________ treatment of water recycling process.

    (a)

    primary

    (b)

    tertiary

    (c)

    secondary

    (d)

    none of the above

  5. Deforestation generally decrease ______________.

    (a)

    Rainfall

    (b)

    Global warming

    (c)

    Soil erosion

    (d)

    Drought

  6. 5 x 1 = 5
  7. Some of the precipitated water moves deep into the soil and increases ground water level is called as _______________.

    ()

    infiltration

  8. Cindrella of the plant kingdom is called as _________________.

    ()

    Water hyacinth

  9. In opuntia leaves are modified into _______________.

    ()

    spines

  10. Plants that grow in dry habitat are called as _______________.

    ()

    Xerophytes

  11. ______________ is a primary nutrient for the survival of all living organisms.

    ()

    Nitrogen

  12. 5 x 1 = 5
  13. Nitrogen is a greenhouse gas

    (a) True
    (b) False
  14. Bats are the only mammals that can fly.

    (a) True
    (b) False
  15. Aestivation is an adaptation to overcome cold condition.

    (a) True
    (b) False
  16. Hydrophytes are common land plants.

    (a) True
    (b) False
  17. Earthworm become inactivate, during hot and dry climate is called as Aestivation.

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. Nitrogen fixation

  20. (1)

    heavy metals scholorination

  21. Nitrification

  22. (2)

    Nitrosomonas

  23. Denitrification

  24. (3)

    Pseudomonas species

  25. Primary treatment

  26. (4)

    Azotobacter

  27. Tertiary treatment

  28. (5)

    heavy. solids, oil grease

    5 x 3 = 15
  29. What are the two factors of biosphere?

  30. What is adaptation?

  31. List some of the ways in which you could save water in your home and school?

  32. What is grey water?

  33. What is IUCN? What is the vision of IUCN?

  34. 3 x 5 = 15
  35. Describe the processes involved in the cyclic flow of water between biotic and abiotic factors of biosphere?

  36. What is water recycling? Explain the conventional wastewater recycling treatment?

  37. List out the advantages of farm ponds.

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