Which of the following character is not found in all the chordates?
Diaphragm
Coelom
Pharyngeal gill slits
Dorsal nerve cord
A
Diaphragm
B
Dorsal nerve cord
C
Coelom
D
Pharyngeal gill slits
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Solution
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All chordates are coelomates, have pharyngeal gill clefts at one stage of their life cycle. They have dorsal nerve cord, which is hollow cord dorsal to the notochord. The diaphragm is only present in mammals.
So, the correct answer is option A.
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