Q50 of 163 Page 228

Which of the following is an artificial ecosystem?

Crop field is an artificial ecosystem because it is a man-made ecosystem. Man makes field to grow crops and does necessary activities that are required by crops to grow. Thus, it is an artificial ecosystem.

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48

Which of the following represents a possible food chain found in a pond:

 49

Which of the following are decomposers of dead organisms?




























Bacteria



Fungi



Viruses



(a) no



yes



yes



(b) yes



no



yes



(c) yes



yes



no



(d) yes



yes



yes


 51

Disposable plastic plates should not be used because:

 52

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