A student hypothesizes that plants require light to grow. She places 15 plants i

Question

A student hypothesizes that plants require light to grow. She places 15 plants in a dark closet for 3 months and gives them equal amounts of water 3 times each week. After 3 months, all of the plants are dead. The student concludes that her hypothesis was correct. Why is her conclusion not valid? A) The student did not water the plants each day. B) The student did not include a control group in her experimental setup. C) The sample size for the experiment was too small. D) Because water was not the variable being tested, the plants should not have been given water.

Explanation / Answer

Answer is Option B, The student did not include a control group in her experimental setup

A control group is the group which is seperated from the experiment group which is taken as a reference. Control group works as a reliable reference or baseline for comparing the results of experiment group. In tthis experiment also, the student has to assign a control group in which the plant has to be kept in the sunlight by giving equal amounts of water 3 times each week. Then the student has to compare both the results inorder to prove her hypothesis that plants require light to grow. Without a contro group we cannot assess the experiment as valid.

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