Question

Notochord is absent in the group.. Pisces, or reptilia or aves or echinodermata

Answer 1

Animals with no notochord are placed in no-chordata group

Answer 2

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⇒Notochord present in Pisces and Reptilia and Notochord absent in Echinodermata

⊕Pisces :

• The animals of this group are found in both sea and fresh water .
• These animals body structure like streamlined body[Body like structure].
• These animals body of skin covered by scales.
• Gills are found for Respiratory organ.
• These animals are poikilothermic means cold blooded animal .
• These animals heart has two chamber - one auricle and one ventricle.
• Example : Dogfish , Rohu etc

⊕Reptilia

• Most of animals of this Class are terrestrial animals .
• Due to their creeping crawling locomotion they are called as Reptiles.
• Reptiles have Poikilothermic means cold Blooded animal.
• These animals heart have three chamber - Two auricle and one ventricle.
• Lungs is the Respiratory organ of this group.
• These animals lay eggs so it's called Oviparous .
• Example : Snake , Tortoise etc.

⊕Echinodermata :

• The animal of this phylum have spiny skin .
• It have hard covering of endoskeleton which are made up of calcium  
• These animal body have Radical symmetry , triploblastic and Coelomate .
• Vascualr system is present so it help in capturing of food , locomotion and respiration .
• Example – Starfish and sea cucumber .