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Which radiations are absorbed by ozone ...

Which radiations are absorbed by ozone layer ?

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. In a food chain consisting of grass, frog, bird and insects, where wil...

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  2. If a harfmul chemical enters a food chain comprising cat, mice and pla...

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  3. Which radiations are absorbed by ozone layer ?

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  4. Name the man made component which is responsible for the depletion of ...

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  5. Name two waste materials which can be recycled.

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  6. Name the process by which the volume of solid wastes can be reduced.

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  7. If 5 joules of energy is available at producer level (plants), then ho...

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  8. State whether the following statement is true or false : Only 10 per...

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

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

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

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

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  13. TEN PER CENT LAW

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

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

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

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  17. Explain how harmful chemicals enter our bodies.

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

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

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

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