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If we excessively use pesticides to prot...

If we excessively use pesticides to protect the crops from diseases, then it may cause lion-term damage to mankind'. Justify this statement.

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. What are the causes of depletion of ozone layer ? Which diseases are l...

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  2. Explain how harmful chemicals enter our bodies.

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  3. If we excessively use pesticides to protect the crops from diseases, t...

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  4. What is meant by biological magnification ? With the help of a food ch...

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  5. What is meant by bioconcentration of pesticides ? Which common pestici...

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  6. What is garbage? What does garbage consist of ?

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  7. MODES OF WASTE DISPOSAL

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  8. How can the wastes such as paper, plastic and metal objects be dispose...

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  9. Give a method for the disposal of household wastes such as left-over f...

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  10. What is meant by incineration? For what purpose is it used ?

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  11. How are most of the solid wastes in urban areas disposed of?

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  12. State two advantages of using disposable paper cups over disposable pl...

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  13. What is sewage ? How is sewage disposed of ?

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  14. EFFECTS OF OZONE DEPLETION

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  15. What would happen if the ozone layer in the atmosphere completely disa...

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  16. (a) With the help of a flow diagram, describe how energy from th sun f...

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  17. (a) What is ozone ? How is it formed ? (b) How does ozone layer prot...

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  18. (a) How is energy introduced into the ecosystem ? (b) Consider the ...

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  19. (a) Explain why, a food chain usually cannot have more than three of f...

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  20. What provides the energy which then flows through a food chain ?

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