Question : Which of the following animals have a single opening in their digestive system that serves both as a mouth and an anus?
Option 1: Arachnids
Option 2: Echinoderms
Option 3: Platyhelminthes
Option 4: Arthropods
Correct Answer: Platyhelminthes
Solution : The correct option is Platyhelminthes .
Platyhelminthes, or flatworms, are a phylum of soft-bodied invertebrates. They include both free-living and parasitic species. Flatworms are characterised by a flattened, ribbon-like body and bilateral symmetry. They lack a body cavity (coelom) and have a simple digestive system with a single opening that serves as both the mouth and anus. Some of its examples include planaria, tapeworms, etc.
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