Classify the following organism based on the absence/presence of true coelom.
Spongilla
A
Acoelomate
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B
Pseudocoelomate
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C
Coelomate
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D
All of the above
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Solution
The correct option is C Acoelomate A coelom is a cavity lined by an epithelium derived from mesoderm. Organs formed inside a coelom can freely move, grow and develop independently of the body wall, while fluid cushions and protects them from shocks. Any organism that lacks a cavity between the body wall and the digestive tract is called as an acoelomate. Spongilla belongs to group Porifera. They have pores all over the body. They do not possess coelom.