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Question:

Which of the following is a serious flaw in the design of this experiment?

A The experiment has no repetition.
Explaination

A good experiment has only one variable, several constants, and a control. This experiment has all of these. However, this experiment lacks repetition. The student should use a group of plants—not just one—to investigate the effect of each pH on plant growth. Therefore, the correct choice is The experiment has no repetition.