Which of the following animals lack alimentary canals (complete digestive systems)?

Earthworm

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Jellyfish

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Insect

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Fish

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Solution

The correct option is B Jellyfish
Jellyfish is a coelenterate and lacks alimentary canal. Digestion is mainly intracellular in it. It can be extracellular also inside the gastrovascular cavity wherein digestive enzymes are secreted by endothelial cells.
In earthworm, insects and fishes, there is a complete digestive system with the mouth as well as anus and digestion take place in the alimentary canal. Thus, the correct answer is option B.

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