Question

Which one of the following is a characteristic of cropland ecosystem?

• A. Absence of soil organisms
• B. Absence of weeds
• C. Ecological succession
• D. Least genetic diversity

Answer 1

The correct option is D

Least genetic diversity

Cropland ecosystem is man-made. They are used to grow a single kind of crop or maybe 2-3 at a time. And since only one kind of crop is present in the field, the genetic diversity between these plants will be least. Cropland can never be devoid of weeds and soil organisms.
Ecological succession occurs in essentially lifeless areas—regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Croplands are usually fertile and the best for sustaining plant life.