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