Which phylum is classified as pseudocoelomate (having a body cavity not completely lined by mesoderm)? (Hard)
Answer and explanation
Correct answer: B. Nematoda
- Step 1: In pseudocoelomates, the body cavity is derived from the blastocoel and lined by mesoderm only on the outer body wall side. Step 2. Nematodes (roundworms such as Ascaris lumbricoides) are classical examples of pseudocoelomate animals. Answer: Nematoda (Aschelminthes). Why not the others: Platyhelminthes is acoelomate (solid parenchyma); Annelida is true eucoelomate (schizocoelous); Arthropoda possesses a true coelom reduced to hemocoel.
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