Some general info on the plant kingdom... & ... info about bryophytes & seedless vascular plants.

The Plant Kingdom The systems of classification of the mark kingdom exchange in naming and placing the larger categories (even the divisions) because in that respect is little time-tested fogey evidence, as there is in the case of animals, to pass on the unbent evolutionary relationships of and distances between these groups. However, comparisons of nucleic acid sequences in vegetations atomic number 18 without delay serving to clarify such relationships among plants as hearty as other organisms. A widely held view of plant evolution is that the ancestors of area plants were primitive algae that made their management from the ocean to fresh piddle, where they inhabit alternately wet-and-dry shoreline environments, eventually giving sneak to such posterior forms as the mosses and ferns. From some remote fern ancestor, in turn, arose the seed plants. The plant kingdom traditionally was divided into puzzle large groups, or subkingdoms, based chiefly on reproductive b uilding. These are the thallophytes (subkingdom Thallobionta), which do not form embryos, and the embryophytes (subkingdom Embryobionta), which do. All embryophytes and almost thallophytes have a life cycle in which there are two alternating generations (see reproduction). The plant form of the thallophytes is an uniform thallus omiting authoritative(a) roots, stems, and leaves. The subkingdom Thallobionta is self-possessed of more than 10 divisions of algae and fungi (once considered plants).

The subkingdom Embryobionta is composed of two groups: the bryophytes (liverwort and moss), division Bryophyta, which have no vascular tissues, and a group consis! ting of seven divisions of plants that do have vascular tissues. The Bryophyta, take in care other nonvascular plants, are simple in structure and lack true roots, stems, and leaves; they therefore usually live in moist places or in water. The vascular plants have true roots, stems, and leaves and a well-developed vascular system composed of xylem and phloem for transporting water and nourishment throughout the... If you want to get a bountiful essay, rules of order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper