Conservation and Use of Natural Resources : 12th Class Biology Q Ans Lesson 26 – NIOS

Conservation and Use of Natural Resources : 12th Class Biology Q Ans Lesson 26 – NIOS

Conservation and Use of Natural Resources : 12th Class Biology Q Ans Lesson 26 - NIOS

INTEXT QUESTIONS 26.1

  1. Given below are certain wrong statements. Identify the mistake and write the correct statement below each.
    (i) Plastic is a natural resource.
    Ans. Plastic is an artificial resource.
    (ii) Forest is an exhaustible non-renewable resource.
    Ans. Forest is an exhaustible renewable resource.
    (iii) The exhaustible resources, which are not replaced after consumption are known as renewable resources.
    Ans. The exhaustible resources, which are not replaced after consumption are known as non-renewable resources.
    OR
    The exhaustible resources, which are replaced after consumption, are known as renewable resources
  2. Classify the following under the three respective categories of natural resources:
    Air, iron, sand, petroleum, wind, clay, fish, forest, gold, pearls.
    Inexhaustible – Air, Sand, Wind
    Renewable – Fish, Forest, Pearl
    Non- renewable – Iron, Petroleum, Gold

INTEXT QUESTIONS 26.2

  1. Why should we conserve natural resources? State any two reasons.
    Ans. (i) To maintain ecological balance for supporting life.
    (ii) To preserve different kinds of species.

INTEXT QUESTIONS 26.3

  1. How do the following cause soil erosion?
    Ans. Wind : Carries away the loose top soil
    Overgrazing : Removes the protective vegetation, thus help in erosion
    by wind and water
    Water : Rain drops carry away the soil not covered by vegetation.
  2. Match the items of column A with those of Column B.
    Column – A Column – B
    (i) Terracing – (c) Practised in hilly areas
    (ii) Erosion – (d) To wear away
    (iii) Deforestation – (b) Cutting down forests
    (iv) Humus – (a) Decayed vegetable or animal matter

INTEXT QUESTIONS 26.4

  1. Why do we consider fresh water as a renewable resource?
    Ans.  It is produced continuously through hydrologic cycle.
  2. Give three methods of water conservation.
    Ans.  (i) Constructing dams and reservoirs
    (ii) Rainwater harvesting
    (iii) Judicious use

INTEXT QUESTIONS 26.5

  1. Some of the following words/terms are related to conservation of biodiversity and some are threat to biodiversity. Identify the points relating to conservation by mentioning ‘C’ and threat to biodiversity by mentioning ‘T’ against the points.
    (i) Wildlife sanctuaries (………………….)
    (ii) Population explosion (………………….)
    (iii) Industrialisation (………………….)
    (iv) Zoo (………………….)
    (v) Tissue culture (………………….)
    (vi) Pollution (……………….
    Ans. (i) C (ii) T (iii) T (iv) C (v) C (vi) T

INTEXT QUESTIONS 26.6

  1. What is Red Data Book?
    Ans. It is published by IUCN that gives information on endangered plants and animals.
  2. Define the term Wildlife.
    Ans. The plants, animals and microbes other than the cultivated plants and
    domesticated animals constitute wildlife

INTEXT QUESTIONS 26.7

  1. Expand the following.
    (i) WWF – World Wildlife Fund
    (ii) CITES – Convention of International Trade in Endangered species
    (iii) IUCN – International Union for Conservation of Natural Resources
  2. Match the items of column A with those of Column B.
    Column – A Column – B
    (i) Periyar sanctuary (a) Rajasthan
    (ii) Kanha National Park (b) Orissa
    (iii) Similipal National Park (c) Uttaranchal
    (iv) Bharatpur bird sanctuary (d) Kerala
    (v) Corbett National Park (e) Madhya Pradesh
    Ans. (i) (d), (ii) (e) (iii) (b)(iv) (a)(v) (c)

INTEXT QUESTIONS 26.8

  1. A and B are two friends. In their daily life both have different opinion on certain
    matters. Considering the necessity of sustainable development give your
    suggestions in the given space.
    A says – Polythene bags should be used to carry vegetables.
    B says – Jute bags should be used to carry vegetables.
    Who is right and why?
    Ans. (i) B is right; because jute bags are biodegradable and eco-friendly. HealthThough science has invented the bio-degradable polythene bags,
    all are not bio-degradable, hence cause pollution.
  2. Mention any two activities which will help in sustainable development.
    Ans. >> reducing excessive use of resources and enhancing resource conservation.
    >> recycling and reuse of waste materials.
    >> scientific management of renewable resources, especially bio-resources.
    >> planting more trees.
    >> green grassy patches to be interspersed between concrete buildings.

INTEXT QUESTIONS 26.9

  1. Coal is a non-renewable source of energy whereas wood charcoal is renewable. Why ?
    Ans. Coal cannot be regenerated after consumption. But wood charcoal is
    obtained from wood and wood can be obtained continuously from trees / forest.
  2. How are the following useful in our day to day life?
    Ans. CNG : Cooking, Transportation
    PNG : Cooking
    LPG : Cooking, Lightening, Transportation
  3. A and B are two friends. In their daily life both have different opinion on certain Health matters. Considering the necessity of sustainable development give your suggestions in the given space.
    A says – Coal should be used as a fuel to cook our food
    B says – LPG should be used as a fuel to cook our food.Who is right and why?
    Ans. B is right LPG causes less pollution than coal.

INTEXT QUESTIONS 26.10

  1. Why do we consider sun as the best source of energy?
    Ans. It is available free of cost and in ample quantity, everlasting. It has no
    boundaries and is also free from political barriers.
  2. What is meant by ‘radioactive pollution’?
    Ans. The radioactive elements when not disposed off properly cause disintegration in the soil and water and thus cause pollution.
  3. What are the advantages and disadvantages of nuclear energy?
    Ans. India has sufficient Thorium to generate electricity cause pollution.
  4. The following table contains the different sources of energy and their uses. Puta tick mark under the source against the appropriate use(s).
    Geothermal, Bio gas, Bio-diesel
    (i) Generation of Electricity– Geothermal, Bio gas, Bio-diesel
    (ii) Fuel for Cooking– Bio gas
    (iii) Fuel for Vehicles– Bio-diesel
  5. Mention any three ways of conservation of electric energy at your home.
    Ans. (i) Judicious use of electricity
    (ii) Use of florescent lamp instead of incandescent lamp
    (iii) Create awareness about the proper use of electricity, or any other

TERMINAL EXERCISES

  1. Define conservation.
  2. What is meant by soil erosion?
  3. Define the term biodiversity.
  4. State the meaning of sustainable development.
  5. Mention any two methods of conservation of energy resource.
  6. Why should wildlife be conserved?
  7. Why is soil considered as both renewable and non-renewable resource?
  8. State any three reasons for degradation of water.
  9. Distinguish between in-situ and ex-situ conservation strategies.
  10. Describe natural gas as conventional source of energy.
  11. Describe the natural and the anthropogenic causes of soil erosion.
  12. Describe the various methods of conservation of soil.
  13. Future generations of mankind will depend more and more on non-conventionalsources of energy. Discuss.
  14. Explain any five methods of conservation of water.
  15. Describe any three non-conventional sources of energy.

NIOS 12th class biology Q Ans

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Himanshu Kumar

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