photon exposure of organism plant exposure radiation exposure light regimen (related) radiation treatment (narrow) A physical plant exposure (PECO:0007316) involvinga treatment or exposure of a plant structure (PO:0009011) with a radiation type, intensity or quantity. Wikipedia:Electromagnetic_radiation Electromagnetic radiation is classified according to the frequency of its waves. The electromagnetic spectrum, in order of increasing frequency and decreasing wavelength, consists of radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. plant_experimental_conditions_ontology PECO:0007151 EO:0007151 physical plant exposure