Scelta multipla
Sponges feed by __________.
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31. Invertebrates
Porifera and Cnidaria
Scelta multipla
Which of the following features is characteristic of the poriferan (sponge) body plan or life history?
A
Closed circulatory system
B
Ventral nerve chord
C
Extracellular digestion
D
specialized respiratory surfaces
E
Motile larvae
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Understand the basic biology of poriferans (sponges). Sponges are simple multicellular organisms that belong to the phylum Porifera. They are primarily sessile as adults, meaning they are attached to a surface and do not move.
Recognize that sponges do not have complex systems like a closed circulatory system or a ventral nerve chord. These features are characteristic of more complex organisms.
Identify the method of digestion in sponges. Sponges perform intracellular digestion, where food particles are engulfed by cells and digested within them, rather than extracellular digestion.
Note that sponges lack specialized respiratory surfaces. They rely on the diffusion of gases directly through their body surfaces, facilitated by the movement of water through their porous bodies.
Understand the life cycle of sponges, which includes motile larvae. While adult sponges are sessile, their larvae are motile, allowing them to disperse and settle in new locations.
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