Q20 of 76 Page 259

What is meant by "sustainable development"?

Sustainable development refers to the use of resources in such a way that the demands of the present can be met without compromising on the needs of the future generations. It is basically for sustaining the finite resources which are necessary for future generations to sustain life on the planet.


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18

Name a clean gaseous fuel other than LPG and natural gas.

 19

Fill in the following blanks with suitable words :

(a) LPG is a ......... fuel but biogas is not a..........fuel.


(b) Glaciers are a source of ...........


(c) One of the main aim of management of forests and wildlife is to conserve the ........... which we hav inherited.


(d) Khadin is a traditional ............ harvesting system in Rajasthan.


(e) When a fuel bums in an insufficient supply of air, then some poisonous gas called ........ is also produced.

 21

What is silviculture? What are its advantages?

 22

Write a short note on 'Chipko Andolan' (Hug the Trees Movement).