Why are crop fields known as artificial ecosystems?
An artificial ecosystem is a human-made system of plants, animals, and people living in an area together with their surroundings. These are not self-sustainable. So these are modified and managed by human beings
Examples: aquariums, botanical gardens, etc.
Crop fields are man-made; plants do not grow naturally in crop fields. Most of the plants are grown by humans according to the season, type of soil, needs, etc.
In crop fields, the land is managed by humans, the soil is prepared for sowing seeds, and constant irrigation is done to get a good yield. Thus, crop fields are known as artificial ecosystems.