First, bacteria, fungi, and algae are classified separately from plants in the six-kingdom system, so they're not technically plants. Any nonvascular plants do not have true roots, stems, and leaves. These include mosses, liverworts, hornworts, etc. read more
Any nonvascular plants do not have true roots, stems, and leaves. These include mosses, liverworts, hornworts, etc. They have leaf-like parts, stem-like parts, root-like parts, but they aren't considered to be true roots/stems/leaves unless they have xylem and phloem. read more
In short, plants evolved roots and shoots. Shoots, in turn, can develop stems and leaves. Roots. Roots are branched, underground structures that serve two major functions. First, somewhat obviously, roots firmly anchor the plant to a fixed spot. read more