Botany - Environmental Issues Model Question Paper

12th Standard EM

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Biology

Time : 02:00:00 Hrs
Total Marks : 50
    10 x 1 = 10
  1. Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?

    (a)

    Ammonia

    (b)

    Methane

    (c)

    Nitrous oxide

    (d)

    Ozone

  2. One green house gas contributes 14% of total global warming and another contributes 6%. These are respectively identified as

    (a)

    N2O and CO2

    (b)

    CFCs and N2O

    (c)

    CH4 and CO2

    (d)

    CH4 and CFCS

  3. The unit for measuring ozone thickness

    (a)

    Joule

    (b)

    Kilos

    (c)

    Dobson

    (d)

    Watt

  4. The plants which are grown in silivpasture system are

    (a)

    Sesbania and Acacia

    (b)

    Solenum and Crotalaria

    (c)

    Clitoria and Begonia

    (d)

    Teak and sandal

  5. Which is not a greenhouse gas?

    (a)

    CO2

    (b)

    N2O

    (c)

    O3

    (d)

    CFC

  6. The total ozone layer over the earth surface is ____________________

    (a)

    30 DU

    (b)

    300 DU

    (c)

    3000 DU

    (d)

    0.3 DU

  7. Identify the potent cause for deforestation.

    (a)

    Agriculture

    (b)

    Soil erosion

    (c)

    Afforestation

    (d)

    Forest fire

  8. Total number of forestry extension centres in Tamil Nadu is ______________

    (a)

    16

    (b)

    32

    (c)

    18

    (d)

    51

  9. Pick out the odd one out _____________

    (a)

    Biosphere reserve

    (b)

    National parks

    (c)

    Wild life sanctuaries

    (d)

    Botanical gardens

  10. EIA stands for ________________

    (a)

    Ecological Information Analysis

    (b)

    Environmental Information Assessment

    (c)

    Environmental Impact Analysis

    (d)

    Environmental Impact Assessment

  11. 5 x 1 = 5
  12. Baccaurea courtallensis

  13. (1)

    Pinus

  14. Nepenthes khasiyana

  15. (2)

    Casuarinas

  16. Invasive species

  17. (3)

    Khasi Hills

  18. Live fence

  19. (4)

    Acacia

  20. Phytoindicator

  21. (5)

    Southern Western Ghats

    5 x 2 = 10
  22. What is ozone hole?

  23. Give four examples of plants cultivated in commercial agroforestry.

  24. Define global warming.

  25. What is ozone layer? Why it is essential?

  26. Define social forestry.

  27. 5 x 3 = 15
  28. How do forests help in maintaining the climate?

  29. List out the effects of global warming.

  30. What are the major activities carried out by forestry extension centers?

  31. Write a short note on Chipko Movement.

  32. Explain the role of lakes in an ecosystem.

  33. 2 x 5 = 10
  34. Explain afforestation with case studies.

  35. What are the effects of deforestation and benefits of agroforesty?

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