[Solved] What part of the ricin molecule is the toxin? A)the disulfide bond B)the polypeptide A chain C)the polypeptide B chain D)the vesicle that surrounds it Vascular Plants: Plants that have specialized tissues (xylem and phloem) for transporting water, nutrients, and sugars throughout the organism. Angiosperms: The traditional name for flowering plants, a very large (more than 300,000 species), diverse phylum of plants that form flowers for sexual reproduction and produce seeds enclosed in fruits; include monocots and eudicots. Gymnosperms: Gymnosperms are a group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes, distinguished from flowering plants by having naked seeds. Liverworts: A group of non-vascular plants belonging to the division Hepaticophyta, characterized by a liver-like appearance and commonly found in moist, shaded environments.