Question

Which of the following are natural ecosystems?

• A. Pond
• B. Crop field
• C. Forest
• D. Lake

Answer 1

Answer: (A), (C), (D)

The correct options are
A Pond
C Forest
D Lake

Natural ecosystem consists of a community of living and non-living organisms, all interacting with each other as a unit through various processes, such as, biological, physical and chemical processes. Whereas, an artificial ecosystem meets all the criteria of a natural ecosystem but is made and controlled by humans.
Pond, forest and lake are examples of natural ecosystems whereas, orchards, farmlands, garden and man-made reservoirs are some examples of artificial ecosystems.