an investigation is done to find out whether plants grow better with decomposing potato peeling or decomposing apple peelings. Which of these would be the control plant? A. plant with apple peeling. B. a plant with potato peelings C. a plant with both apple and potato peelings. D. a plant with no decomposing matter
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Generally a control is one that you are not using any of the tested material on. You want to establish normal growth, so that you can get accurate results from your variables.
I don't understand
You would want to use a plant with no decomposing matter as a control, because you need to know normal growth without any extra fertilizer before you can determine the additional growth due to decomposing matter (like apple peel or potato peel).