STRUCTURE AND FUNCTION IN PROTISTS

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Amoeba proteus: formation of pseudopods

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Cilia: hair-like structures which aid movement and help to produce water currents which bring food to the organism

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Cilia aid in movement

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Stentor uses cilia around the oral groove to pull food into

the food vacuole

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The oral groove of the Paramecium

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Phagocytosis in the Amoeba

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Probing for food

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Euglena is especially interesting since it is green and photosynthetic and has

flagella

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The contractile vacuole is a structure which helps the organism remove excess water from its body

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Some have a proboscis, like an elephants trunk, which helps in

capturing prey .

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Some protists have shells; this one is extending pseudopods from

its shell (test)

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Vorticella has a stalk which can contract to move it rapidly away from a disturbance.

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Bursaria are easy to identify because of their

unusual shape

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Didinium has a horse-shoe shaped nucleus; also note the cilia and

other organelles.

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Reproduction

Some protists form colonies like these algae

Single celled or multi-celled? The volvox is a colonial organism. Here we see daughter cells before they burst out of the mother to become independent colonies of their own.

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diatoms

Trypanasoma: note the blood cells

Spirogyra

The Hay Infusion

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