19 3 Plantlike Protists KEY CONCEPT Algae are
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19. 3 Plantlike Protists KEY CONCEPT Algae are plantlike protists.
19. 3 Plantlike Protists Plantlike protists can be single-celled or multicellular. • Photosynthetic plantlike protists are called algae. colony daughter colony
19. 3 Plantlike Protists • Euglenoids are a large group of plantlike protists. – mostly photosynthetic – some heterotrophic – single-celled pellicle contractile – one or two flagella vacuole nucleus flagellum chloroplast eye spot
19. 3 Plantlike Protists • Dinoflagellates are mostly marine plantlike protists. – have two flagella – may be bioluminescent – have stiff protective plates – can cause red tide Dinoflagellates
19. 3 Plantlike Protists • Diatoms are plantlike protists with glasslike shells. – shells made of silica – produce large amounts of oxygen
19. 3 Plantlike Protists • Multicellular algae are classified by their pigments. – Green algae contain chlorophyll a and b. – Brown algae contain chlorophyll c. – Red algae contain chlorophyll a and phycoerythrin.
19. 3 Plantlike Protists Many plantlike protists can reproduce both sexually and asexually. • All algae can reproduce asexually. – Multicellular algae can fragment. – Chlamydomonas divides into zoospores.
19. 3 Plantlike Protists • Some algae produce sexually. – Some species alternate generations. – Sexual reproduction can be triggered by environmental stress.
