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Bioluminescence
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2. 20-3 Plantlike Protists: Unicellular Algae
Photo Credit: Andrew Syred/Science Photo Library/Photo Researchers, Inc.
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Plantlike protists contain chlorophyll and carry out photosynthesis.
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4. Chlorophyll and Accessory Pigments
What is the function of chlorophyll and accessory pigments in algae?
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5. Chlorophyll and Accessory Pigments
Chlorophyll and accessory pigments allow algae to harvest and use the energy from sunlight.
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Euglenophytes
Euglenophytes
What are the distinguishing features of the euglenophytes?
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Euglenophytes
Euglenophytes are plantlike protists that have two flagella but no cell wall.
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Euglenophytes
Pellicle
Euglena
Contractile vacuole
Carbohydrate
storage bodies
Chloroplast
Nucleus
Eyespot
Euglenophytes are plantlike protists that have two flagella but no cell wall. The green structures inside the euglena shown are chloroplasts, which allow the organism to carry on photosynthesis. Like paramecia, euglenas expel excess water through a contractile vacuole.
Gullet
Flagella
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Euglenophytes
Two flagella emerge from a gullet in the cell. The longer of the flagella spins so it pulls the organism rapidly through the water.
Euglenophytes are plantlike protists that have two flagella but no cell wall.
Gullet
Flagella
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Euglenophytes
Near the gullet is a reddish pigment known as the eyespot, which helps find sunlight to power photosynthesis.
Euglenas can also live as heterotrophs.
Eyespot
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Euglenophytes
Euglenas store carbohydrates in small storage bodies.
Carbohydrate
storage bodies
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Euglenophytes
Euglenas do not have cell walls. Instead, they have an intricate cell membrane called a pellicle.
The pellicle folds into ridges, each supported by microtubules.
Pellicle
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Euglenophytes
Euglenas reproduce asexually by binary fission. .
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Plant-like Protists Phylum Chlyorophyta Green Algae – unicellular (Chlamydomonas) , colonial and multicellular (seaweed)
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Volvox Live in multicellular colonies, hence colonial. Some consist of 500 – cells. Attached by cytoplasmic strands
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16. Ecology of Unicellular Algae
Plantlike protists are important to freshwater and marine ecosystems because they make up the base of the food chain in many aquatic ecosystems.
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17. Ecology of Unicellular Algae
Phytoplankton constitute the population of small, photosynthetic organisms found near the surface of the ocean.
Phytoplankton carry out half of Earth’s photosynthesis. In addition, they provide nourishment for many organisms.
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