Skeleton made of spongin fibres occurs in

Calcarea

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Demospongiae

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Hexactinellida

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Both A and B

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Solution

The correct option is B Demospongiae
A. Sponges of class Calcarea have skeleton made up of calcareous spicules.
B. Sponges of class Demospongiae have skeleton made up of siliceous spicules or spongin fibres or both.
C. Sponges of class Hexactinellida have skeleton made up of siliceous spicules.
So, the correct answer is 'Demospongiae'.

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