Question

Give three major differences between chordates and non-chordates and draw the sketch of a chordate's body showing those features.

Answer 1

The three major differences between chordates and non- chordates are:

i. Notochord: is Present at some stage or replaced by a backbone made of ring like vertebrae in chordates while in non-chordates notochord or backbone is absent.

ii. Nerve cord:  Single, dorsal, without ganglia in chordates, and Double, ventral, usually bearing ganglia in non-chordates

iii. Pharyngeal gill slits: are present in chordates and absent in non-chordates.

Answer 2

$\huge\textbf{Answer}$


» Cordates

Notochord is present in them.

Heart is ventral in them.

Tail is present in them (post anal)

Central nervous system is dorsal and hollow.


» Non - Cordates

Notochord is absent in them.

Heart is present in dorsal side.

Tail is absent in them. (post anal).

Central nervous system is ventral and solid.