A Scientist, Who Wants to Study the Effects of Nitrogen

question 27

Multiple Choice

A scientist, who wants to study the effects of nitrogen on wheat plants, sets up an experiment with four groups of wheat plants: group A gets 10 kilograms per hectare, group B gets 20 kilograms per hectare, group C gets 30 kilograms per hectare, and group D gets 0 kilograms per hectare. Which of the following is the control group?

• A) group A
• B) group B
• C) group C
• D) group D

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