Sam was given the following setups to find out oxygen is required for respiration to take place in peas. He chose set ups A and C for his experiment. His teacher told him that he had made the wrong choice because there is no __(experimental set-up/ control set-up) in his choice.

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Solution

An experiment consists of two set-ups. An experimental set-up and a control set-up. Both are identical in which every condition is the same expect one. The set up in which the condition under study is missing is called the control.

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