question_answer 57)

  Give three major differences between chordates and non chordates and draw a schematic sketch of a chordate showing those features.

Answer:

                  The major differences between Chordates and Non-chordates are as follows

Chordates	Non-Chordates
1. A notochord is present at some stage in the life cycle of a chordate.	Notochord is not present at any stage in the Life cycle of a non-chordate.
2. Gill-slits are present in the pharynx either in embryo or in adult organism.	Pharyngeal gill slits are absent.
3. Tail is present at some stage in the life of the chordate.	Tail is absent in non-chordates.
4. Heart is ventrally located.	Heart (if present) is dorsally located,
5. Central nervous system is dorsal and hollow in chordates.	Central nervous system in non-chordates is solid and ventrally located.

Schematic sketch illustrating important characters of chordates is shown below