NCERT Science Class 10 Chapter 12 Sustainable Management of Natural Resources CBSE Board Sample Problems Long Answer (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question

a. What is water harvesting? List its four benefits.

b. Mention two ways in which water harvesting can be taken.

Solution

a. It is capturing, collection and storage of rainwater and surface runoff for filling either small bodies or recharging ground water.

Benefits of water harvesting are as follows-

  • It ensures water availability.
  • It reduces the chances of flooding during the rainy season.
  • The groundwater is regularly recharged and does not evaporate. It spreads out to recharge wells and provides moisture for vegetation over a wide area.
  • It does not provide breeding grounds for mosquitoes like stagnant water collected in ponds or artificial lakes.

b. The two ways by which water harvesting can be undertaken are:

  • Capturing run-off water from rooftops.
  • Capturing run-off water from local catchments.

Question

What are the advantages of dams? List three main problems caused by the construction of large dams.

Solution

Dams are large water bodies that are built by government agencies across the rivers to regulate the flow of water and generate electricity.

The advantages of dams are as follows-

  • They ensure adequate amount of water for irrigation through a canal.
  • Water in dams is used for generating electricity.
  • They ensure uninterrupted water supply.
  • Problems caused by the construction of large dams are as follows
  • Due to construction of high rise dams, a vast area of land gets submerged under water resulting in the displacement of a large number of people.
  • They lead to deforestation and loss of biodiversity.
  • They need huge expenditure.

Question

a. The Sal forests of (West Bengal) are a great example of the result of people՚s participation in the management of forest.

Explain.

b. List two forces which prevent equitable distribution of resources.

Solution

a.

  • The forest department developed a strategy in which the villagers were involved in the protection of the forest.
  • In return for their labour, the villagers were paid and also had some benefit in silviculture and harvesting operations.
  • They were allowed to take fuel wood and fodder collection on payment of nominal fee.
  • As a result, the Sal forests underwent a remarkable recovery.

b.

i. Over exploitation by industrialists.

ii. Overuse of resources by people.

Question

a. Why do we need to manage our resources?

b. Why is reuse considered to be better than recycle?

c. Name any two stake holders which may be helpful in the conservation of forests.

Solution

a.

i. The resources are limited.

ii. Increasing demand due to increase in population.

b. As no energy is consumed in reusing while recycling involves the consumption of energy.

c.

  • Forest department of the state
  • Local people.