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(a) Describe an activity to show that w...

(a) Describe an activity to show that while paper is biodegradable but plastic (say, polythene) is non-biodegradable.
(b) Explain why, some materials are biodegradable but some are non-biodegradable.

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. How does a biodegradable waste differ from a non-biodegradable waste ?...

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

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

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

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

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

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

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

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

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

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

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

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

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  14. (a) What is meant by non-biodegradable waste materials ? Give two exam...

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  15. (a) Define an ecosystem. Give examples of any two ecosystems. (b) L...

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  16. (a) What is a food chain ? Give one example of a simple food chain. ...

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  17. (a) What is meant by 'environment' ? (b) What type of substances are...

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  18. Which of the following constitutes a food chain ?

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  19. In a food chain, the initial organism is usually :

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  20. Which of the following represents a possible food chain found in a pon...

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