All of the following are coelomates except:
Correct answer: D. Aschelminthes
- A. Deuterostomes
- B. Hemichordates
- C. Proterosomes
- D. Aschelminthes
Explanation
These are the animals having a true body cavity or coelom. The cavity is filled with coelomic fluid. Coelomates are classified as protosomes and deuterostomes. OPTION A: Deuterostomes develop the anus first, then the mouth at the other end of the embryo. Deuterostomes are coelomate animals. OPTION B: All the animals from phylum Annelida to the phylum Chordata are coelomates. OPTION C: Protostomes develop so that the first opening in the embryo is the mouth. Protostomes are bilaterally symmetrical and have three germ layers, the organ level of organization, the tube within-a-tube body plan, and a true coelom. OPTION D: Aschelminthes are called pseudocoelomates. Hence, D is the correct option.
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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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