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

The Plant Kingdom The systems of classification of the mark kingdom transform in naming and placing the larger categories (even the divisions) because at that place is little sure fogey evidence, as there is in the case of animals, to piddle the unbent evolutionary relationships of and distances between these groups. However, comparisons of nucleic acid sequences in adjusts be without delay serving to clarify such relationships among plants as puff up as other organisms. A widely held view of plant evolution is that the ancestors of area plants were primitive algae that made their flair from the ocean to fresh urine, where they inhabit alternately wet-and-dry shoreline environments, eventually giving bone 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 trouble large groups, or subkingdoms, based chiefly on generative coordinate. These are the thallophy tes (subkingdom Thallobionta), which do not form embryos, and the embryophytes (subkingdom Embryobionta), which do. All embryophytes and well-nigh thallophytes have a life cycle in which there are two alternating generations (see reproduction). The plant form of the thallophytes is an consistent thallus omiting veritable(a) roots, stems, and leaves. The subkingdom Thallobionta is composed 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 grou p consisting of seven divisions of plants th! at do have vascular tissues. The Bryophyta, arrest 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 all-embracing essay, rules of order it on our website: OrderCustomPaper.com

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