NCERT Class X Science Class: Chapter –16. Management of Natural Resources – Part-8

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Long Answer Questions

Question 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:

Image Reduce, Reuse and Recycle

Image Reduce, Reuse and Recycle

Image Reduce, Reuse and Recycle

Reduce means to use a material/commodity in lesser quantity, e.g electricity and water

Recycle means a material that is used once is collected and sent back to a manufacturer so that they can make some other useful material from it:

e.g., plastic cups and buckets, glass tumbler, paper, metal objects

Reuse means using a thing over and over again instead of throwing it away. It does not involve the process of recycling either in small or large scale: e.g., used envelopes, plastic carry bags, bottles of jam.

Question 33:

Prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilization can be minimized.

Answer:

(a) Unused water in the water bottle may be used for watering plant

(b) Close all the taps before you go to sleep.

(c) Avoid using a hose pipe for watering plants

(d) Wash vehicles only when they are dirty

(e) Use fan and light only when required

(f) Use solar water heating devices

(g) Use CFL in place of conventional bulbs/tubes

Question 34:

Is water conservation necessary? Give reasons.

Answer:

The total amount of fresh water is more than enough to meet the needs of human beings. But due to its uneven distribution, wide seasonal as well as yearly fluctuation in rainfall sand wastage water shortage is a chronic problem in most parts of the world.

Question 35:

Suggest a few useful ways of utilizing waste water.

Answer:

Waste water can be used for

(a) Recharging the ground water

(b) Can be used for irrigation

(c) Treated municipal water can be used for washing cars, water in the gardens

(c) Certain pollutants in sewage water can become fertilizer for various crops.

Question 36:

What is the importance of forest as a resource?

Answer:

Forests are renewable resources which provide

(a) Habitat, food, protection to wild life.

(b) Help in balancing of atmosphere.

(c) Improves water holding capacity of soil.

(d) Regulates water cycle.

(e) For human being, they are the source for all essential commodities like, fuel wood, timber pulp and paper etc.

(f) It provides useful products like fruits, resins, gums, essential oils, bidi wrapper etc.

Question 37:

Why are the Arabia forests of Bengal known to be a good example of conserved forest?

Answer:

The forest department developed a strategy in which the villagers were involved in the protection of the forest. In return for the labour, the villagers were paid and also had some benefit in harvesting operations. They were allowed to collect wood and fodder on payment of nominal fee. In this way, by the active and willing participation of the local people, the sal forests of Arabia were conserved.