Slide 1 of 33 Bioluminescence ch?v=T2xh9-UPSlU ch?v=UXl8F-eIoiM Copyright Pearson Prentice Hall.

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Bioluminescence

http://www.youtube.com/watch?v=T2xh9-UPSlU

http://www.youtube.com/watch?v=UXl8F-eIoiM

Copyright Pearson Prentice Hall

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20-3 Plantlike Protists: Unicellular Algae


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Plantlike protists contain chlorophyll and carry out photosynthesis.


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Chlorophyll and Accessory Pigments

What is the function of chlorophyll and accessory pigments in algae?



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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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Euglena

Euglenophytes

Gullet

Flagella

Eyespot

Pellicle

Contractile vacuoleCarbohydratestorage bodies

Chloroplast

Nucleus


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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

Gullet

Flagella


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Near the gullet is a reddish pigment known as the eyespot, which helps find sunlight to power photosynthesis.

Euglenas can also live as heterotrophs.

Euglenophytes

Eyespot


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Euglenas store carbohydrates in small storage bodies.

Euglenophytes

Carbohydrate storage bodies


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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.

Euglenophytes

Pellicle


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Euglenophytes

Euglenas reproduce asexually by binary fission.

http://www.youtube.com/watch?v=5fg3Q-hbSsI


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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 – 50 000 cells.

Attached by cytoplasmic strands



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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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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.

Slide 1 of 33 Bioluminescence ch?v=T2xh9-UPSlU ch?v=UXl8F-eIoiM Copyright Pearson Prentice Hall.

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