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Question
Root tuft passes as columella and then forms gastral cone in
Root tuft passes as columella and then forms gastral cone in
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Solution
The correct option is A Hyalonema
A. Hyalonema is the glass rope sponge found in sea only. The body is elevated from the substratum with the help of root tuft often spirally twisted like a rope. The excurrent canals of canal system may open on the gastral surface, which may flush as the gastral cone or depressed to form the spongocoel.B. Spongia is a Turkish bath sponge and is the costliest bath sponge in world.C. Spongilla is the most common widely distributed freshwater sponge growing on submerged plants and twigs.D. Cliona is known as boring sponge. It is harmful to oyster industry as it destroys the shells of oysters.So, the correct answer is 'Hyalonema'.
A. Hyalonema is the glass rope sponge found in sea only. The body is elevated from the substratum with the help of root tuft often spirally twisted like a rope. The excurrent canals of canal system may open on the gastral surface, which may flush as the gastral cone or depressed to form the spongocoel.
B. Spongia is a Turkish bath sponge and is the costliest bath sponge in world.
C. Spongilla is the most common widely distributed freshwater sponge growing on submerged plants and twigs.
D. Cliona is known as boring sponge. It is harmful to oyster industry as it destroys the shells of oysters.
So, the correct answer is 'Hyalonema'.
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