Q21 of 216 Page 473

i. What is ‘Chipko Movement’? Why should we conserve forests?

ii. Suggest any four changes that you would like to be incorporated in the life-style of students of your age to move towards a sustainable use of available resources.


iii. An environmentalist on visit to your school suggested the use of three R’s to save the environment. Explain what he meant by three R’s and how you would follow his advice at home.

i) The Chipko movement was started in April 1973 in Reni village in Uttarakhand where the villagers prevented cutting of trees by embracing the trees. It was an initiative by Sunder Lal Bahugana to stop exploitation of forests.


Forests should be conserved for a variety of reasons since they are sources of essential items like medicine, food, wood etc. Forests prevent soil erosion, prevents floods, prevents global warming and maintains ecological balance.


ii) The four changes that I would like to incorporate in the life-style of students of my age to move towards a sustainable use of available resources are:


a) Support afforestation and prevent deforestation.


b) Encourage rainwater harvesting in the society.


c) There should be two separate bins: one for throwing biodegradable wastes and another for non-biodegradable wastes.


d) Encourage students to cycle or use pool cars for shorter distances instead of motor vehicles or individual cars.


e) Recycle papers and plastic as and when possible.


iii) The three R's he mentioned were:


Reduce, Reuse and Recycle.


These can be followed in a number of ways:


REDUCE:


a) Reusable water bottles should be used.


b) Reduction of plastic bags usage.


c) Electronic mails can be used instead of paper mails.


d) Avoid usage of plastic paper plates, napkins etc.


REUSE:


a)Glass bottles can be reused.


b) Reuse containers, cups, jars, books (can be handed to others when one finishes reading themselves) etc.


RECYCLE


a) Recycled products should be encouraged.


b) Electronic equipments can be recycled.


c) Newspapers can be recycled.


More from this chapter

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19

i. List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.

ii. Write the function of retina in human eye.


iii. Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death?

 20

i. Define electromagnetic induction.

ii. Two coils P and S are wound over the same iron core. Coil P is connected to battery and key and the coil S is connected to galvanometer. Draw a suitable diagram of this arrangement and write your observations when:


A. Current in the coil P is started by closing the key.


B. Current continues to flow in coil P.


C. Current in coil P is stopped by removing the key.


Explain the reason for such observations.


OR


Briefly explain an activity to plot the magnetic field lines around a bar magnet. Sketch the field pattern for the same specifying field directions.


A region A has magnetic field lines relatively closer than another region B. Which region has stronger magnetic field. Give reason to support your answer.

 22

While performing an experiment, a student observes that when he heats some green crystals in a boiling tube, the colour of the crystals changes to brown and a gas evolves which smells like burning sulphur. Interpret the observations and results.

 23

A student is studying the properties of acetic acid in his school laboratory. List two physical and two chemical properties which he must observe and note in his record book.

Two physical and two chemical properties that must be observed and noted are: