- 1(current)
Q. No.Which of the following represents the correct combination without any exception?
| Characteristic | Class | |
| 1. | Mammary gland; hair on body; pinnae; two pairs of limbs | Mammalia |
| 2. | Mouth ventral; gills without operculum; skin with placoid scales; persistent notochord | Chondrichthyes |
| 3. | Sucking and circular mouth; jaws absent; integument without scales; paired appendages | Cyclostomata |
| 4. | Body covered with feathers; skin moist and glandular; lungs with air sacs; fore limbs from wings | Aves |
Subtopic: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Osteichthyes |
 51%
From NCERT
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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 |
 91%
From NCERT
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Regarding Osteichthyes:
| Statement I: | They have four pairs of gills which are covered by an operculum on each side. |
| Statement II: | Air bladder is absent. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: Â Comparative study of Cartilagenous & Bony Fishes |Â Class Osteichthyes |
 81%
From NCERT
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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 |
 71%
From NCERT
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- 1(current)
Q. No.
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