Scelta multipla
Why are ostia important to sponges?
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31. Invertebrates
Porifera and Cnidaria
Scelta multipla
What are the two main body forms found in cnidarians?
A
Polyp and Sponge
B
Polyp and Medusa
C
Medusa and Coral
D
Sponge and Coral
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Cnidarians are a group of aquatic animals known for their distinctive body forms and stinging cells called cnidocytes.
The two main body forms found in cnidarians are the polyp and the medusa.
The polyp form is typically sessile, meaning it is attached to a surface, and has a cylindrical shape with a mouth surrounded by tentacles at one end.
The medusa form is free-swimming and has a bell-shaped body with tentacles hanging down, resembling a jellyfish.
Understanding these two forms helps in identifying and classifying different cnidarian species, as they can exhibit one or both forms during their life cycle.
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