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

question 53

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 also flowers.This suggests that a specific flower-initiating hormone is produced in plants.A properly controlled experiment would also

• A) include grafting together the two plants without inducing the SDP.
• B) lengthen the SDP photoperiod.
• C) include exposing only the LDP plant to P_fr light.
• D) shorten the SDP photoperiod.
• E) include an LDP photoperiod.

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