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- #National Eligilibility Cum Entrance Test
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In sharks, one of the following is absent:
Claspers
Placoid scales
Air bladder
Cartilaginous endoskeleton
Answers (1)
Class Chondrichthyes - Characteristics Features -
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This class contains the fishes with cartilaginous endoskeleton.
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Sharks, rays, skates, saw-fishes etc. belong to this class.
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The notochord persists throughout their life
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They have a tough skin covered with placoid scales.
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They have powerful jaws with modified placoid scales called the teeth. The mouth is ventrally located.
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The gill slits are not protected by an operculum.
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They do not have a swim bladder due to which they swim continuously to prevent sinking.
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They have a two-chambered heart with one atrium and one ventricle.
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They are cold-blooded.
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They have separate sexes. Fertilization occurs internally. They can be oviparous or viviparous.
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chondrichthyes do not have a swim or air bladder.
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