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Which statement is incorrect for animals belonging to class of Chondrichthyes?
(a)Presence of placoid scales
(b)Absence of air bladder
(c)Presence of cartilaginous endoskeleton
(d)Notochord is persistent only at larval stage, after that it disappears

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Important Questions on Animal Kingdom
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a) Chondrichthyes have gill slits covered by operculum and Osteichthyes have gill slits without operculum
b) Chondrichthyes have a swim bladder and Osteichthyes do not have a swim bladder
c) Chondrichthyes contain placoid scales and Osteichthyes contain cycloid scales
d) Chondrichthyes contain terminal mouth and Osteichthyes contain ventral mouth

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Match the following correctly related to cartilaginous fishes ?
Column I | Column II | ||
(i) | Sphyma | (a) | Sting ray |
(ii) | Torpedo | (b) | Dog fish |
(iii) | Trygon | (c) | Saw fish |
(iv) | Pristis | (d) | Electric ray |
(v) | Scoliodon | (e) | Hammer headed shark |

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Statement I: Sternum appeared for the first time in amphibians.
Statement II: Snakes have pairs of cranial nerves.
The correct option among the following is

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Name the classes of Tetrapoda that exhibit the following characters:
Column (A) | Column (B) |
Acrodont | Thecodont |
pairs cranial nerves | pairs cranial nerves |
Cold-blooded | Warm-blooded |
Amphicoelous vertebrae | Amphiplatyan vertebrae |

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