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Question

Which of the following is not a typical character of phylum nematodes?

A
Syncytial epidermis
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B
Pseudocoel
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C
Nonliving cuticle
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D
Gaseous exchange through gills
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Solution

The correct option is D Gaseous exchange through gills
Nematodes commonly referred to as nonsegmented roundworms, threadworms, pinworms constitute the largest phylum Nematoda of superphylum Aschelminthes.
They are having a cylindrical body, a pseudocoel and a complete digestive tract lined by endodermal epithelium. They are aquatic, terrestrial or parasitic roundworms. Their body is elongated, cylindrical and unsegmented with the thick cuticle, cellular or syncytial epidermis and longitudinal muscle cells in four bands. Gaseous exchange occurs through the body surface.
Thus, the correct answer is option D.

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