A) Cliona
B) Euspongia
C) Hyolonema
D) Spongilla
Correct Answer: A
Solution :
Boring sponges, such as Cliona, attach themselves to shells of oysters, clams, barnacles etc., boring them so full of holes that their contained animals are destroyed and in time, the shells are entirely broken up. Lime of these shells gets dissolved into sea water to be used over again by other animals. Sometimes, these boring sponges may prove great nuisance to oyster beds.
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