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Why are there rarely more than five link...

Why are there rarely more than five links (or five organisms) in a food chain ?

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. State whether the following statement is true or false : Only 10 per...

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  2. Where does all the energy in living organisms originate from ?

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  3. Why are there rarely more than five links (or five organisms) in a foo...

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  4. Name two predators of snakes in a food web operating in a forest ecosy...

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  5. Fill in the following blanks with suitable words : (a) Ultraviolet r...

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  6. TEN PER CENT LAW

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  7. Write the full form of CFC. Give its one harmful effect.

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  8. Explain how, harmful ultraviolet radiations of sunlight are prevented ...

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  9. What are the causes of depletion of ozone layer ? Which diseases are l...

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  10. Explain how harmful chemicals enter our bodies.

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

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

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

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

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  15. MODES OF WASTE DISPOSAL

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

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

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

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

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

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