Question

give three major differnce between chordates and non chordates and draw a schematic sketch of a chordate showing these features

Answer 1

Difference # Chordates:

1. A notochord is present at some stage in the life of a chordate.

2. Central nervous system is dorsal and hollow

3. Gill slits are present in the pharynx either in the embryo or adult.

4. Tail is present at some stage in the life of the chordate.

5. Heart is ventral.

6. If present RBCs contain respiratory pigment (haemoglobin).

Difference # Non-chordates:


1. Notochord is not present at any stage in the life of a non-chordate.

2. Central nervous system is ventral and solid.

3. Gill slits are absent.

4. Tail is absent.

5. Heart is dorsal (if present).

6. If haemoglobin or other respiratory pigment is present, it is found in the blood plasma. RBCs are absent.

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.