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12th Standard Biology English Medium Environmental Issues Reduced Syllabus Important Questions With Answer Key 2021

12th Standard

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Biology

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

    Multiple Choice Questions

    15 x 1 = 15
  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. Deforestation does not lead to

    (a)

    Quick nutrient cycling

    (b)

    soil erosion

    (c)

    alternation of local weather conditions

    (d)

    Destruction of natural habitat weather conditions

  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. ___________ is not a method of waste water treatment.

    (a)

    oxidation ponds

    (b)

    Anaerobic lagoons

    (c)

    Catalytic converter

    (d)

    Anaerobic bioreactor

  6. Which is not a greenhouse gas?

    (a)

    CO2

    (b)

    N2O

    (c)

    O3

    (d)

    CFC

  7. Which is not a beneficial aspect of Agroforestry?

    (a)

    Nutrient cycling is improved

    (b)

    Balance in O2 - CO2 composition

    (c)

    Suitable for wetland where rainfall is maximum

    (d)

    Reduces water run-off problem 

  8. Who is celebrated as Forest Man of India?

    (a)

    Anand Mohan Chakrabarthy

    (b)

    Dr. M.S. Swaminathan

    (c)

    Jadav Molai Payeng

    (d)

    Choudhary Ram Dhan

  9. Which is not true with respect to prosopis julifiora?

    (a)

    Invasive species native to Mexico

    (b)

    Arrest wind erosion

    (c)

    Absorb hazardous chemical from soil

    (d)

    Decreases O2 content of water bodies

  10. Biochar is ________________
    (i) a kind of char coal used as a soil amendment
    (ii) a potent way of sequestering carbon
    (iii) made from biomass via pyrolysis
    (iv) a notable solid, rich in carbon.

    (a)

    (i) and (ii) is correct

    (b)

    (ii) and (iv) is correct

    (c)

    (i) and (ii) is correct

    (d)

    all the above is correct

  11. Which is not a true statement regarding rainwater harvesting?

    (a)

    Mitigates groundwater quality

    (b)

    Reduces soil erosion

    (c)

    Decreases soil salinity

    (d)

    No wastage of land for storing

  12. _____________ is a plant species which acts as an indicator of Nitrate pollution.

    (a)

    Petunia

    (b)

    Lichens

    (c)

    Gladiolus

    (d)

    Pinus

  13. Identify the plant species that is not used as a live fence.

    (a)

    Sesbania grandiflora

    (b)

    Acacia species

    (c)

    Petunia species

    (d)

    Erythrina species

  14. Assertion (A): Social forestry refers to management of forests and afforestation on barren lands.
    Reason (R): Afforestation involves the cutting of trees.

    (a)

    A is correct R is incorrect.

    (b)

    A is incorrect R is correct.

    (c)

    R explains A.

    (d)

    Both A and R are incorrect.

  15. Assertion (A): In zoological parks, the animals are maintained in their natural habitat.
    Reason (R): Ex-situ conservation refers to protecting species in their natural habitat.

    (a)

    A is correct R is incorrect.

    (b)

    A is incorrect R is correct.

    (c)

    R explains A.

    (d)

    Both A and R are incorrect.

  16. 2 Marks

    10 x 2 = 20
  17. Give four examples of plants cultivated in commercial agroforestry.

  18. List out the anthropogenic sources of Nitrous oxide.

  19. What is Dobson unit?

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

  21. Define ozone hole. Name anyone potent chemical that is responsible for the effect.

  22. Define the term Agroforestry. Name any two major tree species cultivated in Agroforestry.

  23. Point out the adverse effect caused by invasive species.

  24. Give the names of any four famous sacred groves in Tamil Nadu.

  25. What is carbon sequestration?

  26. How EIA is beneficial to a society?

  27. 3 Marks

    10 x 3 = 30
  28. How do sacred groves help in the conservation of biodiversity?

  29. What are the adverse effects of global warming on plants?

  30. Suggest few ways to overcome global warming.

  31. Ozone acts as a natural sunscreen - Justify.

  32. Give a detailed account on clean development mechanism.

  33. Write a short note on Chipko Movement.

  34. Explain the role of lakes in an ecosystem.

  35. Name the movement launched by the people of MandaI village to protect the trees by hugging them.

  36. Recently in January 2019, our Tamil Nadu Government had imposed a ban on using 14 different products of plastic origin. Mention any six plastic products that you know.

  37. Due to plastic ban scheme in our state, people are gradually switching over to other optionals for daily activities. As a biology student, suggest few eco-friendly alternatives for this issue.

  38. 5 Marks

    7 x 5 = 35
  39. Suggest a solution to water crisis and explain its advantages.

  40. Explain afforestation with case studies.

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

  42. List out the major effects of Ozone Depletion.

  43. What are the objectives of Afforestation programme?

  44. How Eichhornia crassiper spoils the Indian ecosystem?

  45. Write in detail about Remote sensing and its uses.

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