WBBHSC Class 12 Environmental Studies Higher Secondary Examination 2020

WBBHSC Class 12 Environmental Studies Higher Secondary Examination 2020
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WBBHSC Class 12 Environmental Studies Higher Secondary Examination 2020

Time: 3 Hours 15 Minutes

(First 15 Minutes for reading the question paper only, 3 Hours for writing) 

Full Marks – 80

PART – B [Marks: 40]

1. Select the correct answer out of the options given against each question and write in the box provided on the right-hand side bottom : [1 × 24 = 24]

(i) The main cause of increase in soil acidity is—

  1. application of excess chemical fertilizer
  2. application of excess biofertilizer
  3. excessive land erosion
  4. all are correct

(ii) As per 1974 survey, approximately what percentage of cropland in northern Nigeria was prevalent with ‘Mixed Farming’?

  1. Over 80%
  2. Less than 40%
  3. 20%
  4. None of these

(iii) Approximately what percentage of nutrients remain stored above the ground in temperate-zone forests?

  1. 3%
  2. 20%
  3. 50%
  4. none of these

(iv) In which country was the ‘Convention on Biodiversity’ (C.B.D) held?

  1. Iran
  2. South Africa
  3. India
  4. Brazil

(v) What is the present total number of threatened plant species in India?

  1. 1336
  2. 39
  3. 72
  4. 17

(vi) In which year was the ‘Indian Forests Act’ promulgated?

  1. 1956
  2. 1970
  3. 1927
  4. 1932

(vii) In which year was the ‘Atomic Energy Act’ promulgated in India?

  1. 1962
  2. 2002
  3. 1929
  4. None of these

(viii) Bt crop is a type of—

  1. hybrid crop
  2. natural crop
  3. genetically modified crop
  4. none of these

(ix) In which year was the first ‘Conference on Human Environment’ held at Stockholm?

  1. 1972
  2. 1992
  3. 2005
  4. 1987

(x) The smallest unit in the classification of organisms is—

  1. Class
  2. Family
  3. Species
  4. Genus

(xi) Who first coined the word ‘biodiversity’?

  1. E. O. Wilson
  2. E. Haeckel
  3. A. Tansley
  4. R. Carson

(xii) How many people in the world face death out of pesticide poisoning every year?

  1. 20,000
  2. 40,000
  3. 60,000
  4. None of these

(xiii) How much area of global land is getting lost due to soil erosion every year?

  1. 180 lakh hectares
  2. 30 lakh hectares
  3. 40 lakh hectares
  4. 5 lakh hectares

(xiv) What is the difference between the day lengths of ‘tropical’ and ‘temperate’ countries in the summer period?

  1. 4 hours
  2. 2 hours
  3. 1 hour
  4. 3 hours

(xv) Where is the primitive plant ‘Citrus Indict found in India?

  1. Tura district (Meghalaya)
  2. Purulia district (West Bengal)
  3. Ranchi district (Jharkhand)
  4. All are correct

(xvi) Approximately how many species of bacteria are found in India?

  1. 451
  2. 258
  3. 850
  4. None of these

(xvii) What is the permissible range of pH in drinking water as per ‘IS : 10500’?

  1. 6.5 – 8.5
  2. 5.5 – 7.5
  3. 7.5 -10.5
  4. 5.5 – 6.5

(xviii) What is the maximum permissible limit of noise at night time in a residential area?—

  1. 75 dB (A)
  2. 55 dB (A)
  3. 50 dB (A)
  4. 45 dB (A)

(xix) Approximately what percentage of the world’s total faunal wealth is found in India?—

  1. 12 .4
  2. 20.4
  3. 6.4
  4. None of these

(xx) What percentage of Goa’s total land area is covered by mines?

  1. 30
  2. 14
  3. 5
  4. 21

(xxi) How many species of flowering plants are found in Andaman- Nicobar Islands?

  1. 1500
  2. 1700
  3. 2000
  4. None of these

(xxii) What was the main reason for the destruction of the Maya civilization?

  1. Meteoritic shower
  2. Famine
  3. Climate change
  4. All are correct

(xxiii) How many plant species are found in North-East India only?

  1. 1000
  2. 1500
  3. 2500
  4. 200

(xxiv) What was the main theme of the ‘Brundtland Commission’ Report?

  1. Sustainable development
  2. Continuous expansion of agriculture
  3. Continuous expansion of industries
  4. Continuous expansion of education

2. Answer the following questions in very brief (Alternatives are to be noted): [1 × 16 = 16]

  1. What is ‘Rhizobium’? Or; Give one example of biological pest control.
  2. What is ‘Glomus’? Or; What is ‘Agroforestry’?
  3. What is ‘Humus’? Or; Give an example of a leguminous plant.
  4. State the role of earthworms in the soil. Or; What is ‘Azospirillum’?
  5. What is the full form of ‘D.D.T.’? Or; State the importance of ‘Trichoderma’.
  6. What is the importance of ‘blue-green algae’ in the environment?
  7. What type of pollution arises due to excessive irrigation on land?
  8. What is the scientific name of the ‘Siris’ plant? Or; What do you mean by ‘rare’ animal species?
  9. Give an example of a toxic metal found in soil.
  10. What do you mean by ‘Fossil-Fuel Age’?
  11. What do you mean by ‘Sustainable Economy’?
  12. What is a ‘Megabiodiversity Nation’? Or; Where are coral reefs found in India?
  13. What is ‘Genetic Biodiversity’? Or; What is a ‘World Heritage Site’?
  14. What is the full form of ‘R.S.P.M.’?
  15. What is the full form of ‘C.I.T.E.S’?
  16. What is ‘bio-accumulation’?

PART    A [Marks: 40]

1. Answer the following questions (Alternatives are to be noted): [ 8 × 5 = 40]

(i) Write a short note on the ‘Biosphere Reserves’ of India. What is a ‘Tissue Bank’? 6 + 2

Or; Write a short note on ‘Wildlife Trade’. What is a ‘Gene Resource Centre’? 6+2

(ii) Discuss the major steps that are needed for environmental protection in India.

Or; State any for resolutions adopted in the Earth Summit (1992).

(iii) Explain, with the help of a diagram, the relationship between ‘ecological development’ and ‘socio-economic development’.

(iv) Discuss the role of governmental and non-governmental organizations in achieving sustainable development in India.

(v) Explain the role of ‘agro-chemicals’ on the environment.

Or; Explain the necessity of ‘sustainable agriculture’ in India.

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