The short-day plants are plant A and plant D; The Long day plants are plant C and plant E.
1) Plants in short day; From the given data in the table, we can tell that flowers after a long night and plant flowers after long night were interrupted by the flash of far-red light and a flash of red light. Thus, plant A and plant D are short-day plants.
2) Plants in the long day; Flowers after a long night and flowers after a short night light interrupted them. Thus, plans in the long day are plant C and plant E.
3) Plants on a neutral day; These had plant flowers in all photoperiods possible where photoperiods controls flowering in various plants. Thus, they are plant B and plant F.
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