Plant kingdom is divided into three phyllums namely;
(1) Thallophyta
(2) Bryophyta
(3) Tracheophyta
Thallophytes:
Are microscopic plants which have no true roots, stems, and leaves. They have cellular cell wall, some are unicellular (chlamydomynas) while others are multicellular (e.g spirogyra). They also live in colonies e.g volvox.
Bryophytes:
Are multicellular green plants, that lack true roots, stems, and leaves. They posses asexual reproduction by spores, in which there is alternation of generation. E.g mosses and liverwort,
Tracheophytes
Are vascular plants grouped into two sub-divisions: pteridophyta and spermatophyte
Pteridophyta are multicellular, vascular green plant which are non-flowering plants. E.g ferns.
Spermatophyta are multicellular, seed producing flowing plant, which are divided into gymnosperm and angiosperm. The gymnosperm produces naked seeds, without flowers. E.g cycads, and conifer. The angiosperm produces enclosed seeds in their fruit. Angiosperm is further divided into dicotyledons and monocotyledon plants.
Dicots bears seeds with two seed leaves or cotyledons, while monocots bears seeds with only one seed leaf or cotyledon
