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(a) Define trophic level. Draw the food ...

(a) Define trophic level. Draw the food chain with four trophic levels.
(b) What will happen if we kill all orgainsms in one trophic level ?

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. What is meant by a primary consumer, secondary consumer and a tertiary...

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  2. Give an example of a four step food chain operating in grassland. Name...

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  3. (a) Define trophic level. Draw the food chain with four trophic levels...

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  4. What is the difference between the food habits of organisms belonging ...

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  5. Can the organisms of any trophic level be removed without causing any ...

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  6. Consider the food chain : Grass to Deer to Lion What will happen i...

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  7. The number of malaria patients in a village increased tremendously whe...

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  8. How does a biodegradable waste differ from a non-biodegradable waste ?...

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  9. Which of the following are biodegradable and which non-biodegradable ?...

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  10. (a) Describe an activity to show that while paper is biodegradable bu...

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  11. Write doen a food chain : (a) in the sea (b) which ends with human...

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  12. At which trophic level a person is feeding when he is eating : (a) r...

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  13. A student went to study a local pond. In one part of the pond she noti...

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  14. Construct (a) a long food chain, and (b) a short foodchain, ending wit...

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  15. (a) State one advantage of using jute bags over plastic bags for shopp...

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  16. We do not clean ponds or lakes but an aquarium needs to be cleaned per...

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  17. What will be the consequence of the absence of decomposers in the ecos...

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  18. Give two differences between food chain and food web.

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  19. Write one or two words for each of the following statements/definition...

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  20. (a) What is meant by biodegradable waste materials ? Give two examples...

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