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Class Chondrichthyes MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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Class Chondrichthyes - Characteristics Features is considered one of the most asked concept.
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22 Questions around this concept.
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What will you look for to identify the sex of the following?
Which one of the following groups of animals is correctly matched with its one characteristics feature without even a single exception?
Chondrichthyes is characterised by
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Temprature changes in the environment affect most of the animals which are
A marine cartilaginous fish that can produce electric current is
Concepts Covered - 1
Class Chondrichthyes - Characteristics Features
- This class contains the fishes with cartilaginous endoskeleton.
- Sharks, rays, skates, saw-fishes etc. belong to this class.
- The notochord persists throughout their life
- They have a tough skin covered with placoid scales.
- They have powerful jaws with modified placoid scales called the teeth. The mouth is ventrally located.
- The gill slits are not protected by an operculum.
- They do not have a swim bladder due to which they swim continuously to prevent sinking.
- They have a two-chambered heart with one atrium and one ventricle.
- They are cold-blooded.
- They have separate sexes. Fertilization occurs internally. They can be oviparous or viviparous.
Examples:
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Shark (dogfish) Scoliodon |
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Electric Ray Torpedo |
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Sting Ray |
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Rays and Skates |
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