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

question 213

Multiple Choice

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

• A) graft together the two plants and not induce the SDP.
• B) omit the LDP.
• C) omit the SDP.
• D) shorten the SDP photoperiod.
• E) include an LDP photoperiod.

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