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Question

Which of the following is not a group of man-made ecosystems?
  1. Forest and grassland ecosystems
  2. Crop field and aquarium
  3. Desert and pond ecosystems
  4. River and estyary

A
River and estyary
B
Crop field and aquarium
C
Forest and grassland ecosystems
D
Desert and pond ecosystems
Solution
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Ecosystems can be of two types: Natural and Artificial or man-made ecosystems.
  • Natural ecosystems are self-sustaining ecosystems and contain natural factors and organisms, These include marine ecosystem (lakes, rivers, estuaries, ponds, oceans etc.), grassland ecosystem, forest ecosystem and desert ecosystem
  • Artificial or man-made ecosystems have less diversity and have no self regulatory mechanism. These include dams, aquariums, gardens etc.
So, the correct answer is option A, B and D.

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