Spirostomum Biology Worksheet
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Spirostomum
STUDENT RESOURCE 1.6
ACTIVITY SHEET
Spirostomum is a one-celled protozoan with a central digestive
tube. Look for a long cylinder-shaped cell. When you see a
spirostomum, look for the structures shown in the diagram.
Striations
Cilia
(act like muscles)
(move the cell)
Mouth
(takes in food)
Nucleus
(controls the cell;
looks like a string
of beads)
Food Vacuole
(digests food)
Contractile Vacuole
(squirts out extra water)
Movement A spirostomum’s body has spiral rows of cilia.
The cilia beat back and forth to move the organism with a
snake-like wiggling motion.
Feeding Beating cilia sweep small organisms into the
spirostomum’s mouth.
Reproduction The organism divides in half. The nucleus splits,
too.
Size 1 to 3 mm (the largest and most complex one-celled protist)
Answer the following question.
Can a spirostomum make its own food? Explain
CLASSIFICATION • SECTION 1 MICROORGANISMS
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