No, not all plants have vascular bundles. Vascular bundles are specialized tissues that transport water, minerals, and nutrients throughout the plant body. They consist of xylem, which transports water and minerals from the roots to the leaves, and phloem, which transports sugars and other organic compounds from the leaves to the rest of the plant. Vascular bundles are found in most higher plants, including angiosperms (flowering plants) and gymnosperms (non-flowering plants). However, some primitive plant groups, such as bryophytes (mosses, liverworts, and hornworts), do not have vascular bundles. These plants rely on diffusion for the transport of water and nutrients.