A) Ocean
B) Pond
C) Desert
D) Forest
Correct Answer: A
Solution :
Ecosystem is a unit of ecology which is consist of biological community and it?s physical environment both interacting and exchanging materials as well as energy e.g., Desert ecosystem, forest ecosystem. 70% of earth is ocean, here various types of food chains form food webs. So ocean ecosystem is most stable ecosystem on earth and this stability is due to buffering action of water. Forest, pond and desert ecosystems are not much stable. Desert occupies about 1/5 of land. It lacks rain and there is less development of vegetation.
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