Which of the following is not a group of man-made ecosystems?
Forest and grassland ecosystems
Crop field and aquarium
Desert and pond ecosystems
River and estyary
A
River and estyary
B
Crop field and aquarium
C
Forest and grassland ecosystems
D
Desert and pond ecosystems
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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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