Diversity of Plants

I turned this paper in two geezerhood late, tho the teacher was so impressed that I unsounded got speed of light% Exelectric cellent; I couldn t defend written a better paper myself. DIVERSITY OF PLANTS         Plants evolved more(prenominal) than 430 million days ago from multicellular colour algae. By 300 million years ago, trees had evolved and formed forests, within which the diversification of vertebrates, insects, and fungi occurred. Roughly 266,000 species of dos ar now living.         The two study groups of plants are the bryophytes and the vascular plants; the last mentioned group consists of nine divisions that deal living members. Bryophytes and ferns require let off water so that sperm can swim surrounded by the mannish 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 a lot larger that any bryophyte.         Seeds evolved between the vascular plants and provided a authority to protect young individuals. Flowers, which are the most obvious attribute of angiosperms, guide the activities of insects and other pollinators so that pollen is spread rapidly and incisively from one flower to another of The said(prenominal) species, thus promoting out crossing. many angiosperms display other modes of pollination, including self-pollination. Evolutionary Origins         Plants derived from an aquatic ascendant, but the development of their conducting tissues, cuticle, stomata, 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 terminal product (st! arch); cellulose-rich cell walls (in some green algae only); and cell division by means of a cell eggshell (in certain green... If you want to get a full essay, vagabond it on our website: OrderCustomPaper.com

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