I turned this paper in two eld late, tho the teacher was so impressed that I heretofore got speed of light% Ex carrellent; I couldn t fill written a better paper myself. DIVERSITY OF PLANTS Â Â Â Â Â Â Â Â Plants evolved a good deal than 430 million days ago from multicellular colour algae. By 300 million years ago, trees had evolved and formed forests, within which the variegation of vertebrates, insects, and fungi occurred. Roughly 266,000 species of workss ar now living. Â Â Â Â Â Â Â Â The two major(ip) groups of plants are the bryophytes and the vascular plants; the last mentioned group consists of nine divisions that give living members. Bryophytes and ferns require let off water so that sperm can swim surrounded by the manly and female sex organs; intimately early(a) plants do not. vascular plants have elaborate water- and food conducting strands of cells, cuticles, and stomata; many an(prenominal) of these plants are much larger that any bryophyte. Â Â Â Â Â Â Â Â Seeds evolved between the vascular plants and provided a intend to protect young individuals. Flowers, which are the most obvious singularity of angiosperms, guide the activities of insects and other pollinators so that pollen is spread rapidly and on the dot from one flower to another of The said(prenominal) species, thus promoting out crossing. some angiosperms display other modes of pollination, including self-pollination.
Evolutionary Origins         Plants derived from an aquatic ascendent, but the ontogenesis of their conducting tissues, cuticle, st omata, and seeds has made them progressively! less bloodsucking on water. The oldest plant fossils date from the Silurian Period, some 430 million years ago.         The common ancestor of plants was a green alga. The similarity of the members of these two groups can be demonstrated by their photosynthetic pigments (chlorophyll a and b,) carotenoids); chief entrepot product (starch); cellulose-rich cell walls (in some green algae only); and cell division by means of a cell base (in certain green... If you want to get a full essay, swan it on our website:
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