Answers:
True
Group D✔✔✔
Explanation:
Group A❌
Group B❌
Group C❌
Group D✔✔✔
A control group (in all sciences, not only biology) is a particular group of experimental subjects that are not introduced to the experimental change. For example: in an experiment to test for the effect of sunlight on plant growth, the test subjects are introduced to varying range of exposure to the sun while the control group is kept in the dark.
In this case study, group D gets 0 pounds per acre, so the control group is the group not given nitrogen.
