The document summarizes terpenoid biosynthesis in plants. It discusses that terpenoids are synthesized from two C5 precursors, IPP and DMAPP. There are three main steps: 1) biosynthesis of IPP and DMAPP, 2) condensation of these units to form acyclic terpenoids, and 3) cyclization and introduction of functional groups. It provides details on the biosynthesis pathways and resulting terpenoid compounds from C5 to C20 precursors, including monoterpenes, sesquiterpenes, and diterpenes.