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CBSE Class 9 Answered

Why fishes and crocodiles are seperated into different groups even if they both leave in water medium?
Asked by Vinay | 16 Feb, 2015, 06:23: AM
answered-by-expert Expert Answer

Fish and crocodiles are both vertebrates. However, fish belongs to Class Pisces while crocodiles belong to Class Reptilia. Organisms that belong to Class Pisces are exclusively aquatic animals while organisms that belong to Class Reptilia are terrestrial as well as aquatic.  

Characteristic features of fish which classifies them into Class Pisces:

  • Respire through their gills and obtain oxygen dissolved in water.
  • Skin is rough and covered with scales/plates which form the exoskeleton.
  • They do not have limbs for locomotion, but have paired or unpaired fins with the help of which, they move in water.

Characteristic features of crocodiles which classifies them into Class Reptilia:

  • Body is covered with dry water-proof skin having horny epidermal scales or dermal scute plates.
  • The skin is dry, rough and has horny scales on it.
  • Respire only with lungs.

Therefore, fishes and crocodiles are separated into different groups even though they both live in water medium.

Answered by Sheetal Kolte | 16 Feb, 2015, 10:55: AM
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