Scelta multipla
How do sponges obtain their food and what do they primarily consume?
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31. Invertebrates
Porifera and Cnidaria
Scelta multipla
Which of the following is a defining characteristic of the phylum Porifera?
A
Having a porous body structure with specialized cells
B
Exhibiting bilateral symmetry
C
Possession of stinging cells called cnidocytes
D
Presence of a gastrovascular cavity
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Identify the key characteristics of the phylum Porifera. Porifera, commonly known as sponges, are simple multicellular organisms.
Understand that Porifera are known for their porous body structure. This means they have numerous pores and channels allowing water to circulate through them.
Recognize that Porifera do not exhibit bilateral symmetry. Instead, they have an asymmetrical or radial symmetry.
Note that Porifera do not possess stinging cells called cnidocytes. These are characteristic of the phylum Cnidaria, which includes jellyfish and corals.
Acknowledge that Porifera do not have a gastrovascular cavity. This is a feature of Cnidarians and some other phyla, but not sponges.
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