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We do not clean ponds or lakes but an aq...

We do not clean ponds or lakes but an aquarium needs to be cleaned periodically. Why ?

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The correct Answer is:
Pond is a complete ecosystem having decomposer organisms which are the cleansing agents themselves. Aquarium is a sort of incomplete ecosystem in the sense that it does not have decomposer organisms for cleansing purposes.
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We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why ?

(a) Natural water bodies are not regularly cleaned whereas an aquarium needs regular cleaning. Why ? (b) What are decomposers? What will be the consequence if the decomposers are completely eradicated from an ecosystem? Give justification in support of your answer.

Why do you need to clean an aquarium periodically while ponds do not need to be cleaned?

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LAKHMIR SINGH & MANJIT KAUR-OUR ENVIRONMENT-Exercise
  1. Construct (a) a long food chain, and (b) a short foodchain, ending wit...

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

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

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

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

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

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

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

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

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

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

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  12. Which of the following constitutes a food chain ?

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

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

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  15. Which of the following are decomposers of dead organisms ?

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  16. Which of the following is an artificial ecosystem ?

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  17. Disposable plastic plates should not be used because :

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  18. In a food chain, the third trophic level is always occupied by :

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  19. Accumulation of non-biodegradable pesticides in the food chain in incr...

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  20. If a grasshopper is eaten by a frog, then the energy transfer will be ...

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