What induces the apex to change from a vegetative to a flowering state? Daylength(photoperiodism) is another factor Three classes of plants: Longday plant (LDP), Oats Shortday plant(SDP), Strawberry Day neutral plant(NDP), rice▪ Daylength (photoperiodism) is another factor ▪ Three classes of plants: ▪ Longday plant (LDP), Oats ▪ Shortday plant (SDP), Strawberry ▪ Day neutral plant (NDP), Rice What induces the apex to change from a vegetative to a flowering state?