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Class Chondrichthyes MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • Class Chondrichthyes - Characteristics Features is considered one of the most asked concept.

  • 23 Questions around this concept.

Solve by difficulty

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?

A marine cartilaginous fish that can produce electric current is :

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Gymnosperms are also called soft wood spermatophytes because they lack :

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:

 

Shark (dogfish)

Scoliodon

  • Fast swimming predators

  • Jaws lined with pointed teeth

Electric Ray

Torpedo

  • Flat and broad body with whip like tail

  • Generates electric current

Sting Ray

  • Tail has sharp barbed spike

  • Possess a poison sting

Rays and Skates

  • Feed on molluscs

  • Slow and bottom living

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Class Chondrichthyes - Characteristics Features

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