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Question

Body skeleton of sponges are made of 
  1. collar cells 
  2. ostia
  3. spongocoel 
  4. spicules 


Solution

The correct option is D spicules 
Sponges belongs to phylum Porifera. Their body is supported by a skeleton made up of spicules or spongin fibres. Phylum Porifera exhibits characteristic body structure made of a loose aggregate of cells, internal cavities canals lined with food filtering flagellated cells, called the choanocytes. These are also called the collar cells and are a characteristic feature of this phylum. 

Ostia are small pores or openings found on the surface of the sponges.
Spongocoel is the large central cavity present in the body of sponges.  

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