DENDROLOGY

Detailed explanation-1: -photo-a combining form meaning “light” (photobiology); also used to represent “photographic” or “photograph” in the formation of compound words: photocopy. Also especially before a vowel, phot-.

Detailed explanation-2: -The word photography is derived from the Greek word “photos, ‘’ meaning light, and “graphos, ‘’ drawing. Modern photography traces its roots back to the camera obscura, a drawing aid artists and scientists used to record images as early as the eleventh century.