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Chrysophyta - their great size the tissue organization in...

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Chrysophyta Members of the division Chrysophyta are golden algae, most of which are diatoms.  Diatoms  have  cell walls or shells composed of two overlapping halves impregnated with silica. In the oceans, the  diatoms carry on photosynthesis. They serve as an important source of food in the oceanic food  chains. Diatomaceous earth, a light-colored porous rock composed of the shells of diatoms, is made  into a commercial product called diatomite. Diatomite is used as a filler, absorbent, and filtering  agent.  Phaeophyta Members of the division Phaeophyta are the brown algae. These organisms, which are multicellular,  are found almost exclusively in salt water, where they are known as rock weeds and kelps. Despite 
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Unformatted text preview: their great size, the tissue organization in these algae is quite simple compared with the other plants. Often they are used as fertilizers and sources of iodine. Chlorophyta Members of the division Chlorophyta are green algae, some of which are flagellated. The common laboratory specimen Spirogyra is classified here, as are other flagellated species. Many colonial forms are also classified as Chlorophyta; the colonial forms may represent the first evidence of multicellularity in evolution. Ulva , the common sea lettuce, is classified here....
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