Plant and Others Classification

Long ago, a Greek, Aristotle, divided plants according to their stem type. Bryophytes have no vascular tissue and are found in damp places. They include mosses which have small delicate leaves, and liverworts which have thick leathery leaves. Plants which do contain vascular tissue are called tracheophytes. Most of these reproduce by seed, but pteridophytes, also known as ferns, do not. In fact ferns, mosses, and liverworts reproduce by spores. Flowering plants are known as angiosperms, while the conifer group are known as gymnosperms. The latter produce seeds in cones. All true plants make their own food by photosynthesis. Although algae also make their own food, they do not have true roots, stems, and leaves. They all live in water. Fungi are not true plants because they do not make their own food. Their cells contain no chlororphyll (green colour). Instead they get their food by digesting other living or dead organisms. Lichens actually consist of two organisms - an alga and a fungus - which work together. They are often found on bare rocks or on tree bark.