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The blind sac body plan is applicable to members of .......... of kingdom Animalia

1. Porifera
2. Annelida and Arthropoda
3. Cnidaria and Platyhelminthes
4. None of the above

Correct answer: Cnidaria and Platyhelminthes

Solution

A blind sac body plan means the digestive system has a single opening, so food enters and wastes leave through the same opening. Cnidaria and Platyhelminthes fit this pattern because they do not have a complete through-gut.

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