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What percentage of the solar energy is t...

What percentage of the solar energy is trapped and utilised by the plants ?

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. What would happen to the number of grass plants and foxes if the numbe...

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  2. (a) Match the terms given in column I with the terms given in column I...

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  3. What percentage of the solar energy is trapped and utilised by the pla...

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  4. What percentage of energy available at the producer level is transferr...

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  5. Name the process in which a harmful chemical enters the food chain and...

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  6. In a food chain consisting of grass, frog, bird and insects, where wil...

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

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  8. Which radiations are absorbed by ozone layer ?

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

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  10. Name two waste materials which can be recycled.

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

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

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

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

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

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

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

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  18. TEN PER CENT LAW

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

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

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