Give three major differences between chordates and non-chordates and draw a schematic sketch of a chordate showing those features.
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Chordates |
Non-chordates |
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(i) Notochord is present in at least one stage of the life cycle. |
(i) Notochord is absent. |
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(ii) Pharyngeal gill slits are present |
(ii) Pharyngeal gill slits absent. |
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(iii) Post anal tail is present. |
(iii) Post anal tail is absent. |
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(iv) Heart is ventrally located. |
(iv) Heart (if present) is dorsally located. |
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(v) Cent ra l nervous system is dorsally located and is hollow.
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(v) Central nervous system is ventrally located and is solid. |
