Diatoms diatoms are among the most common types of

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Diatoms Diatoms are among the most common types of phytoplankton. Most are unicellular, although they can exist as colonies in the shape of filaments or ribbons. These algae hardly look like plants. Whatever their shape, all diatoms have shell-like, brittle cell walls made of silica, called frustule, and pectin. Division Chlorophyta (green algae) The green algae include unicellular and colonial microalgae as well as the larger, multicellular macroalgae known as seaweed. Green algae are similar to plants in that they contain chlorophyll a , chlorophyll b and carotenoids and use starch as their food storage product. Also, like plants, most green algae have a cell wall composed of cellulose. Therefore, green algae are generally considered to be the evolutionary precursors of plants. Chlamydomonas are unicellular and contain an eyespot, a cup-shaped chloroplast, 2 flagella, pyrenoid and a nucleus. Volvox are colonial. Each cell possesses 2 flagella, enabling the colony to be mobile. There is an extracellular matrix holding the colony of cells together. Spirogyra are also colonial, being organized into long filaments. Each cell contains a spiral chloroplast with pyrenoids and a nucleus. Division Phaeophyta (brown algae) All brown algae are multicellular, , mostly marine macroalgae. Brown algae contain chlorophyll a , chlorophyll c and carotenoids. Most brown algae contain the pigment fucoxanthin , which is responsible for the distinctive greenish-brown color that gives them their name. Because of their size, many large brown algae called kelps provide habitats for other marine organisms. Division Rhodophyta (red algae) This group consists primarily of multicellular, marine macroalgae. Red algae have chlorophyll a , chlorophyll c
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Christopher Reinemann
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