NCERT Exemplar Class 10 Science Solutions

Chapter 16-Sustainable Management of Natural Resources-MCQs

Long Answer Type Questions
Q.32. In the context of conservation of natural resources explain the terms reduce, recycle and reuse. From among the materials that we use in daily life, identify two materials for each category.
Answer.
Reduce: It means wise and lesser use of resources.
For example: Reduce the use of electricity by switching it off when not in use and reduce the use of water.
Recycle: It is the process of collection of used items and converting them into new useful things.
For example: Recycling of old newspapers and used note books to form new papier, recycling of plastic, metallic and glass objects to form another useful products.
Reuse: It means using a thing again and again instead of throwing it away.
For example: Reuse the water from RO in watering plants or washing clothes, reuse of envelopes, glass containers etc. for storage of things.
Q.33. Prepare a list of five activities that you perform daily in which natural resource can be conserved or energy utilization can be minimized.
Answer.
(i) Switch off fans and lights when not in use.
(ii) Practices using renewable resources like solar radiation and energy and cost efficient CFLs.
(iii) Use of eco-friendly fuel CNG, practices to reduce consumption of fuel in vehicles such as car pool, public transport etc.
(iv) Reuse the water from RO in watering plants or washing clothes, reuse of glass containers pickles etc for storage in kitchen.
(v) Use of pressure cooker for cooking to save gas.
Q.34. Is water conservation necessary? Give reasons.
Answer. Yes, water conservation is necessary because:
(i) Water distribution is uneven and large tracts are deficient in rain as well as groundwater.
(ii) Unequal distribution of water in major parts of our country makes most of the population face water scarcity.
(iii) Requirement of water for urban and industrial areas is higher than availability.
(iv) Seasonal rainfall pose a need for irrigation to crops.

Q.35. Suggest a few useful ways of utilizing waste water.
Answer.
(i) Use of waste water for recharging the ground water.
(ii) Use of waste water for irrigation.
(iii) Use of waste water/RO water in household activities like washing clothes, cleaning etc.
(iv) Treatment of municipal water followed by its use for cleaning purposed and watering plants etc.
Q.36. What is the importance of forest as a resource?
Answer. Forests are renewable natural resource and serve as
(i) Source of food and shelter for wildlife thereby play important role in conservation of biodiversity.
(ii) Help improving water holding capacity of soil and prevent soil erosion.
(iii) Source of rainfall and moisture
(iv) Source of atmospheric oxygen and remove harmful carbon dioxide from atmosphere during photosynthesis thereby turning a harmful gas into the only source of organic compounds on earth.
(v) Regulates water cycle.
(vi) Serves as source of fuel, wood, timber, fruits, resins, food etc.
Q.37. Why are the Arabari forests of Bengal known to be a good example of conserved forest?
Answer. The Arabari forests located in Midnapur district of West Bengal were badly degraded. West Bengal Forest Department, 1972 planned to revive the degraded woods by involving the villagers of the surrounding area to the protect 1272 hectares of this forest. In return villagers were benefitted by getting employment in silviculture and harvesting. They were allowed to collect wood and fodder on payment of nominal fee. The people cooperated with full vigour as the regained their rights to forest produce. In this way, by the active and willing participation of the local people, the sal forests of Arabari were conserved.