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Solution


Q.

Lakes and ponds do not require cleaning but an aquarium does because
1 an aquarium is an artificial and a complete ecosystem.  
2 lakes and ponds are natural and complete ecosystems.  
3 an aquarium possesses a pool of decomposers.  
4 lakes do not possess any decomposers and thus BOD always remains low.  

Ans.

(2)

Lakes and ponds do not require cleaning but an aquarium does because an aquarium is an artificial ecosystem. It is complete and lacks natural decomposers.