单词	alga
释义	alga /ˈalɡə / noun (usually in plural algae /ˈaldʒiː/ /ˈalɡiː/) A simple, non-flowering, and typically aquatic plant of a large assemblage that includes the seaweeds and many single-celled forms. Algae contain chlorophyll but lack true stems, roots, leaves, and vascular tissue. Divisions Chlorophyta (green algae), Heterokontophyta (brown algae), and Rhodophyta (red algae); some (or all) are frequently placed in the kingdom Protista. That is, a simple alga like Volvox and a complex metazoan like an octopus both occupy the same sublevel.... It is a blue-green alga, a primitive plant of the same class as seaweeds or the green slime seen on rocks and jetties when uncovered by the sea at low tide. The phenomenon was first described in a red alga and a green alga more than 30 years ago. Derivatives algal /ˈalɡəl / adjective ... After their split from the green algae, a red algal cell was engulfed by a nonphotosynthetic protist and reduced to a plastid. Photosynthesis and primary production were the monopoly of bacteria and algal protists that populated the world's shallow seas. The diet of Daphnia was supplemented with an algal suspension of Chlorella SP. Origin Mid 16th century: from Latin, 'seaweed'. Rhymes realgar, Trafalgar
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