Shells of oysters, clams and barnacles get attached to boring sponges, like
A
Spongilla
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B
Cliona
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C
Suberites
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D
Hyalonema
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Solution
The correct option is BCliona Cliona is also called as 'boring sponge'. It is bright yellow with small pores. It creates round holes in the shells of molluscs, especially oysters and uses them as substratum. They usually live in lagoons or on reefs but sometimes make their home on dead molluscs or other shelled creatures. Thus, the correct answer is option B.