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Chordata Protochordata - Questions and Answers

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51. In higher chordates, pharyngeal gill slits are
A. Absent
B. Present in the embryo
C. Replaced by abdominal gill slits
D. Replaced by thoracic gill slits
Explanation:
52. Gill slits of chordates are
A. Paired
B. Lateral perforations
C. Pharyngeal
D. All the above
Explanation:
53. Nerve cord of chordates is
A. Dorsal
B. Hollow
C. Ventral
D. Both A and B
Explanation:
54. Notochord like structure is present in hemichordates in the region
A. Proboscis
B. Collar
C. Trunk
D. Tail
Explanation:
55. Which one belongs t hemichordata
A. Salpa
B. Balanoglossus
C. Petromyzon
D. Myxine
Explanation:
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