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This Concept Map, created with IHMC CmapTools, has information related to: Plants, phyotochrome r (Pr) is inactive form, long day plants (LDP) will flower when day length longer than critical period, phytochrome fr (Pfr) is active form, phytochrome exist as phyotochrome r (Pr), short day plants (SDP) will flower when day length shorter than critical period, photoreceptors known as phytochrome, longer than critial period same as day length shorter than critical period, photoperiodism controlled by night length, phytochrome exist as phytochrome fr (Pfr), Plants can be grouped as long day plants (LDP), Plants respond to relative day length, Plants has photoreceptors, relative day length known as photoperiodism, Plants can be grouped as short day plants (SDP), night length which is longer than critial period, night length which is shorter than critical period, shorter than critical period same as day length longer than critical period