Environmental Science Book Back Questions

9th Standard

    Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
    4 x 1 = 4
  1. All the factors of biosphere which affect the ability of organisms to survive and reproduce are called as _______________.

    (a)

    biological factors

    (b)

    abiotic factors

    (c)

    biotic factors

    (d)

    physical factors

  2. Increased amount of ___________ in the atmosphere, results in greenhouse effect and global warming

    (a)

    carbon monoxide

    (b)

    sulphur dioxide

    (c)

    nitrogen dioxide

    (d)

    carbon dioxide

  3. 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

  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. 3 x 1 = 3
  6. Nitrogen is a greenhouse gas

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

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

    (a) True
    (b) False
  9. 4 x 1 = 4
  10. Nitrogen fixation

  11. (1)

    Putrefying bacteria

  12. Ammonification

  13. (2)

    Azotobacter

  14. Nitrification

  15. (3)

    Nitrosomonas

  16. Denitrification

  17. (4)

    Pseudomonas species

    3 x 3 = 9
  18. What are the two factors of biosphere?

  19. What is adaptation?

  20. What is grey water?

  21. 2 x 5 = 10
  22. Describe the processes involved in the cyclic flow of water between biotic and abiotic factors of biosphere?

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

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