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Question
Which one of the following is not a class of phylum Porifera?
Which one of the following is not a class of phylum Porifera?
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Solution
The correct option is D Hydrozoa
Porifera is divided into three classes based on the skeleton they possess:
a. Calcarea - e.g., Sycon. This class includes sponges with skeleton made up of calcium carbonate containing spicules.
b. Hexactinellida - e.g., Euplectella. This class includes sponges with skeleton made up of silicon containing spicules.
c. Demospongiae - e.g., Spongilla. This class includes sponges with a skeleton made up of silicon-containing spicules or spongin fibers or both. On the other hand, Hydrozoa is a class of individually very small, predatory animals belonging to the phylum Cnidaria. Thus, the correct answer is option C.
Porifera is divided into three classes based on the skeleton they possess:
a. Calcarea - e.g., Sycon. This class includes sponges with skeleton made up of calcium carbonate containing spicules.
b. Hexactinellida - e.g., Euplectella. This class includes sponges with skeleton made up of silicon containing spicules.
c. Demospongiae - e.g., Spongilla. This class includes sponges with a skeleton made up of silicon-containing spicules or spongin fibers or both. On the other hand, Hydrozoa is a class of individually very small, predatory animals belonging to the phylum Cnidaria.
Thus, the correct answer is option C.
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