The control group in an experiment is the group that does not receive the treatment or experimental variable, allowing the scientist to compare the results with those of the groups that do. In this case, the control group is the one that receives 0 pounds of nitrogen per acre, which is group D.
A scientist, who wants to study the effects of nitrogen on wheat plants, sets up an experiment with 4 groups of wheat plants: group A gets 20 pounds per acre, group B gets 40 pounds per acre, group C gets 60 pounds per acre, and group D gets 0 pounds per acre. Which of the following is the control group?
group A
group B
group C
group D
1 answer