Chondrichthyes:
1. are marine animals and have cartilaginous endoskeleton
2. have a mouth located dorsally
3. have teeth that are modified cycloid or ctenoid scales directed backwardly
4. have the capacity to regulate their body temperature
Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
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What would not be true regarding cartilaginous fishes?
1. In males, pelvic fins bear claspers
2. Some of them have electric organs [Torpedo]
3. None of them is viviparous
4. Some possess poison sting [Trygon]
Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
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Identify the incorrect statement regarding bony fishes:
I: They have four pairs of gills which are covered by an operculum on each side.
II: Due to the absence of air bladder, they have to swim constantly to avoid sinking.
III: Skin is covered with placoid scales.
IV: Mouth is mostly terminal.
 
1. Only II 2. Only II and III
3. Only I and IV 4. Only IV
Subtopic:  Comparative study of Cartilagenous & Bony Fishes |
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