SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Class Calcarea
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Class Demospongiae
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Class Hexactinellida
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None of the above
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Detailed explanation-1: -All freshwater sponges are in the class Demospongiae, order Spongillida.
Detailed explanation-2: -freshwater sponge, any of about 20 species of the genus Spongilla (class Demospongiae, siliceous sponges), a common, widely occurring group.
Detailed explanation-3: -Demosponges (Demospongiae) are the most diverse class in the phylum Porifera. They include 76.2% of all species of sponges with nearly 8, 800 species worldwide (World Porifera Database). They are sponges with a soft body that covers a hard, often massive skeleton made of calcium carbonate, either aragonite or calcite.
Detailed explanation-4: -Demosponges are the sponges most commonly seen whilst diving or walking along the shore. Unlike the other two classes whose members are all marine, demosponges can also be found in freshwater. In the past, these sponges were used as bath sponges.
Detailed explanation-5: -Class Demospongiae includes approximately 4, 750 species in 10 orders. Their geographic distribution in the marine environment is from the intertidal to the abyssal zone; some species inhabit freshwater. Members of the Demospongiae are asymmetrical.