Q. No.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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In chondrichthyes:
| 1. | Mouth is ventral, teeth are modified ctenoid scales and directed forwards. |
| 2. | Mouth is ventral, teeth are modified placoid scales and directed backwards. |
| 3. | Mouth is dorsal, teeth are modified ctenoid scales and directed forwards. |
| 4. | Mouth is dorsal, teeth are modified placoid scales and directed backwards. |
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
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Consider the given two statements:
| Assertion (A): | Cartilaginous fishes have to swim continuously to avoid sinking |
| Reason (R): | Cartilaginous fishes lack a swim bladder |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is False. |
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
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How many of the given pairs are correctly matched?
I. Scoliodon - Dog fish
II. Pristis- Saw Fish
III. Trygon - Sting ray
IV. Carcharodon- Blue whale
1. 1
2. 2
3. 3
4. 4
I. Scoliodon - Dog fish
II. Pristis- Saw Fish
III. Trygon - Sting ray
IV. Carcharodon- Blue whale
1. 1
2. 2
3. 3
4. 4
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
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Consider the two statements:
| Statement I: | Cartilaginous fishes have internal fertilization |
| Statement II: | Many cartilaginous fishes have viviparity |
| 1. | Statement I is correct and Statement II is incorrect |
| 2. | Statement I is incorrect and Statement II is correct |
| 3. | Both Statement I and Statement II are correct |
| 4. | Both Statement I and Statement II are incorrect |
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
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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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The characteristics of osteichthyes include:
1. Only I and II
2. Only II and III
3. Only I and III
4. I, II and III
| I: | Four pairs of gills covered by an operculum on each side |
| II: | Skin covered with placoid scales |
| III: | Regulation of buoyancy by an air bladder |
2. Only II and III
3. Only I and III
4. I, II and III
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
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Consider the given two statements:
| Assertion (A): | The swim bladder is an essential organ for bony fishes. |
| Reason (R): | It allows them to maintain buoyancy without expending energy. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
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