Question
Biology Question on Kingdom Animalia
Which of the following character is not found in all the chordates:
A
Diaphragm
B
Coelom
C
Pharyngeal gill clefts
D
Dorsal nerve cord
Answer
Diaphragm
Explanation
Solution
Diaphragms are not a universal feature of chordates. While all chordates have a dorsal solid nerve cord, a notochord (which may be replaced by a vertebral column in some), and pharyngeal gill clefts (which may be present during embryonic development), the presence of a diaphragm is specific to mammals and is not found in all chordates.
So, the correct option is (A): Diaphragm