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Echinodermata and Protochordata

Which of the ...

Question

Which of the following is the most distinctive feature in the animal kingdom that distinguishes invertebrates from the chordates?

A

Vertebral column

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B

Notochord

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C

Dorsal tubular nerve cord

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D

Gills and lungs

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Solution

The correct option is B Notochord
Invertebrates are animals which do not possess a notochord. Examples include earthworm, cockroach, starfish etc. Chordates are animals that possess a notochord. It includes sea squirts, fishes, amphibians, reptiles, birds, mammals etc. Among the higher chordates, the notochord gets replaced by the vertebral column. These organisms are called vertebrates. Vertebrata is a sub-phylum under Phylum Chordata.

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