Which one of the following statements about certain given animals is correct?
Correct answer: A. Roundworms (Aschelminthes) are pseudocoelomates
- A. Roundworms (Aschelminthes) are pseudocoelomates
- B. Molluses are acoelomates
- C. Insects are pseudocoelomates
- D. Flatworms (Platyhelminthes) are coelomates
Explanation
Roundworms, or Aschelminthes, are indeed pseudocoelomates. They have a body cavity called a pseudocoelom that is partially lined with mesoderm, unlike true coelomates where the coelom is entirely surrounded by mesoderm. This pseudocoelom provides some space for organ development and circulation of fluids.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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