Experiments have shown that when a short-day plant (SDP) and a long-day plant (LDP) are grafted together and the SDP is exposed to a photoperiod that causes it to flower, the LDP flowers as well.This observation supports the theory that a specific flower-initiating hormone is produced in plants.A properly controlled experiment would repeat the grafting procedure but

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A properly controlled experiment would involve repeating the procedure under conditions where the variable thought to cause the effect (in this case, the induction of flowering in the SDP) is not present. This would help determine if the observed effect (flowering in the LDP) is indeed due to the variable being tested (the induction of the SDP) or if it occurs independently of it.

Experiments Have Shown That When a Short-Day Plant (SDP) and a Long-Day