Question

Which of the following is not a group of man-made ecosystems?

• A. Forest and grassland ecosystems
• B. Desert and pond ecosystems
• C. Crop field and aquarium
• D. River and estyary

Answer 1

Answer: (A), (B), (D)

Forest and grassland ecosystems
Desert and pond ecosystems
River and estyary

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.