Give two examples of artificial or man made ecosystems. List the salient features by which they differ from natural ecosystems. 

Explanation

(a) Two examples man - made ecosystems are : Gardens and parks, crop fields and fishery tanks .
(b) Salient features of man - made ecosystems :
(i) These are simple and highly efficient .
(ii) These are generally monoculture (e.g. field crops) with low biodiversity.
(iii) These ara generally unstable.
(iv) These are more vulnerable to sudden changes because of low boiodiversity , stability and self - regulation.