Differentiate between pseudocoelom and true coelom.

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Solution

A pseudocoelom arises from the blastocoel (hollow space situated in the blastula) at an early stage of embryonic development. It remains bounded on the outside by the ectoderm and on the inside by an endodermal layer.
A true coelom originates by a split within the embryonic mesoderm (schizocoelom). The cavity of the coelom is thus bounded by a lining of mesodermal cells called peritoneum. The coelomic cavity is filled with coelomic fluid.

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Q. Classify the following organisms based on the absence/presence of true coelom (i.e, acoelomate, pseudocoelomate and coelomate)

Spongilla, Sea anemone, Planaria, Liverfluke Wuchereria, Ascaris, Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.

Question 40
Classify the following organisms based on the absence/presence of true coelom (i.e., acoelomate, pseudocoelomate and coelomate)
Spongilla, Sea anemone, Planaria, Liver fluke, Wuchereria, Ascaris, Nereis, Earthworm, Scorpion, Birds, Fishes, Horse.

Q. Short answer type questions
What is a pseudocoelom ? What are the advantages of having a coelom ? Name the invertebrate phylum that has a pseudocoelom?

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