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Consider the following statements: A. Annelids are true coelomates B. Poriferans are pseudocoelomates C. Aschelminthes are acoelomates D. Platyhelminthes are pseudocoelomates Choose the correct answer from the options given below:
Acoelomates = Platyhelminthes. Pseudocoelomates = Aschelminthes (roundworms). Coelomates (Eucoelomates) = Annelids to Chordates! Statement A is the ONLY true statement!
Presence or absence of a cavity between the body wall and the gut wall is very important in classification. The body cavity, which is lined by mesoderm is called coelom. Animals possessing coelom are called coelomates, e.g., annelids, molluscs, arthropods, echinoderms, hemichordates and chordates. Statement A is correct.
In some animals, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm. Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates, e.g., Aschelminthes (Statement C is false). The animals in which the body cavity is absent are called acoelomates, e.g., Platyhelminthes (Statement D is false). Sponges (Porifera) lack true body cavities altogether (Statement B is false).
Only statement A is correct, corresponding to Option (4).
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Statement C is false; Aschelminthes are pseudocoelomates, not acoelomates.
Statement D is false; Platyhelminthes are acoelomates, not pseudocoelomates.
Statement B is false; Porifera are not pseudocoelomates.
Correctly identifies Statement A as the only factually true statement.
Swapping acoelomate (flatworms) and pseudocoelomate (roundworms).
"Animals possessing coelom are called coelomates, e.g., annelids, molluscs, arthropods, echinoderms, hemichordates and chordates... In some animals the body cavity is not lined by mesoderm... called pseudocoelom, e.g., aschelminthes. The animals in which the body cavity is absent are called acoelomates, e.g., platyhelminthes."
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