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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:  Comparative study of Cartilagenous & Bony Fishes | Class Osteichthyes |
Level 3: 35%-60%
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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:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |
 71%
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:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes | Class Osteichthyes |
 90%
Level 1: 80%+
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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:  Comparative study of Cartilagenous & Bony Fishes | Class Osteichthyes |
 81%
Level 1: 80%+
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Consider the two statements:
Statement I: Chondrichthyes lack the capacity to regulate their body temperature.
Statement II: Osteichthyes have the capacity to regulate their body temperature.
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
Subtopic:  Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes | Class Osteichthyes |
 69%
Level 2: 60%+
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