Question

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

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

Answer 1

The correct option is B Least genetic diversity

Cropland ecosystem is man-made. they are used to grow a single kind of crop or maybe 2-3 crops at a time. And since only one kind of crop is present in the field, the genetic diversity between these plants will be least.
Ecological succession occurs in essentially lifeless - 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. Croplands can never be devoid of weeds and soil organisms.