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Solution


Q.

Fishes living in a crop field with standing water are the part of a/an ________ ecosystem.
1 natural    
2 indigenous  
3 artificial    
4 none of these  

Ans.

(2)

Crop fields are man-made ecosystems. If these have standing water as in the case of rice field, they can be used to culture fish. The fish in this water would be the part of an artificial ecosystem.