Which of the following is the most distinctive feature in the Animal Kingdom that distinguishes non-chordates from chordates?

Setae

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Notochord

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Dorsal tubular nerve cord

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Gills and lungs

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Solution

The correct option is B Notochord
Non-chordates 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.

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