- 1(current)
Q. No.| 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 |
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Which of the following is not a cartilaginous fish?
| 1. Saw fish | 2. Dog fish |
| 3. Sea horse | 4. Sting ray |
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| 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] |
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| 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 |
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| 1. Angel fish | 2. Flying fish |
| 3. Star fish | 4. Fighting fish |
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| 1. endotherms | 2. marine fishes |
| 3. protochordates | 4. bony fishes |
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The structure marked as ‘S’ in the given diagram helps bony fishes in:
1. Oxygenation of blood
2. Achieving neutral buoyancy
3. Increasing absorptive surface area for food
4. Protection of the nerve cord
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Q. No.
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