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Chondrichthyes, exhibit all of the following characters, except
- a)Endoskeleton is cartilaginous
- b)Notochord persists throughout life
- c)Fertilisation is usually external and most of them are oviparous
- d)Air bladder and lungs are absent
Correct answer is option 'C'. Can you explain this answer?
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Chondrichthyes, exhibit all of the following characters, excepta)Endo...
Chondrichthyes Characteristics:
Chondrichthyes, also known as cartilaginous fish, exhibit several distinct characteristics that set them apart from other types of fish.
Endoskeleton:
- Chondrichthyes have a cartilaginous endoskeleton, as opposed to a bony endoskeleton found in other fish species. This cartilaginous structure provides flexibility and lightness to their bodies.
Notochord:
- While Chondrichthyes do have a notochord during embryonic development, it is eventually replaced by vertebrae made of cartilage. The notochord does not persist throughout their entire life, unlike in some other vertebrates.
Fertilisation and Reproduction:
- Chondrichthyes typically exhibit internal fertilization, with males using claspers to transfer sperm into the female. Most species are oviparous, laying eggs that develop outside the mother's body. However, some species are viviparous, giving birth to live young.
Air Bladder and Lungs:
- Chondrichthyes lack a swim bladder, which is a common feature in bony fish that helps regulate buoyancy. Additionally, they do not possess lungs for respiration, relying solely on their gills to extract oxygen from the water.
Therefore, the correct answer is option C, as Chondrichthyes do not usually exhibit external fertilization and are not predominantly oviparous.
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Chondrichthyes, exhibit all of the following characters, excepta)Endo...
In chondrichthyes, fertilisation internal and many are viviparous.
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Chondrichthyes, exhibit all of the following characters, excepta)Endoskeleton is cartilaginousb)Notochord persists throughout lifec)Fertilisation is usually external and most of them are oviparousd)Air bladder and lungs are absentCorrect answer is option 'C'. Can you explain this answer?
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