What term refers to plants that have neither true vascular tissue nor true roots, stems, or leaves?

The term that refers to plants lacking true vascular tissue, as well as true roots, stems, or leaves, is nonvascular plants. These plants are generally smaller and rely on diffusion and osmosis to transport nutrients and water since they do not have specialized structures for these functions. Examples of nonvascular plants include mosses, liverworts, and hornworts.

In contrast, vascular plants, which include both angiosperms and gymnosperms, possess true vascular tissues (xylem and phloem) that facilitate the transportation of water and nutrients throughout the plant. The distinction is important as it highlights different evolutionary adaptations within the plant kingdom.