Difference between Non-chordates and Chordates MCQ - Practice Questions with Answers

BASIS OF DIFFERENCE

                       NON-CHORDATES

                        CHORDATES

Body Temperature

Cold blooded 

Warm or cold blooded

Notochord

Absent 

Present at some stage or throughout the life cycle

Haemoglobin 

Absent or in plasma

In red blood cells

Nervous System

Solid and ventral nerve cord

Hollow and dorsal nerve cord

Germ layers

Absent, triploblastic or diploblastic

Triploblastic 

Coelom 

Can be acoelomate, pseudocoelomate, coelomate 

Coelomate 

Symmetry 

Can be asymmetrical, radial or bilateral 

Bilateral 

Post-anal tail

Absent 

Usually present

Brain 

Either absent or present above pharynx

Present dorsal to pharynx

Position of digestive tube 

Dorsal to nerve cord

Ventral to nerve cord

Pharyngeal gill-slits

Absent

Present at some stage of life

Blood vascular system

Absent and if present, open or closed

Closed 

Heart

Absent and if present dorsal or lateral

Ventrally placed

Exoskeleton/ Endoskeleton

Only exoskeleton is present

Both are present