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Q. No.Which of the following differentiates bony fishes from the cartilaginous fishes?
| A: | Presence of a swim bladder in bony fishes. |
| B: | A gill cover or operculum in cartilaginous fishes. |
1. Only A is correct.
2. Only B is correct.
3. Both A and B are correct.
4. Both A and B are incorrect.
Subtopic: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Chondrichthyes |
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Level 2: 60%+
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Which of the following statements accurately highlights a significant difference between the class Osteichthyes and Chondrichthyes?
| 1. | Osteichthyes possess a swim bladder which aids in buoyancy, whereas Chondrichthyes lack a swim bladder and must constantly swim to avoid sinking. |
| 2. | Chondrichthyes have an operculum covering their gills, while Osteichthyes do not have any covering over their gill slits. |
| 3. | Both Osteichthyes and Chondrichthyes have a skeleton made entirely of bone, making them rigid and durable in aquatic environments. |
| 4. | Chondrichthyes exhibit external fertilization whereas Osteichthyes typically display internal fertilization mechanisms. |
Subtopic: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Chondrichthyes |Â Class Osteichthyes |
 90%
Level 1: 80%+
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Consider the two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Chondrichthyes lack the capacity to regulate their body temperature. |
| Statement II: | Osteichthyes have the capacity to regulate their body temperature. |
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Chondrichthyes |Â Class Osteichthyes |
 70%
Level 2: 60%+
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- 1(current)
Q. No.
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