Question
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:
Schematic sketch illustrating important characters of chordates is shown below:
| | 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. |
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