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In which one of the following the genus name, its two characters and its phylum are not correctly matched, whereas the remaining three are correct?

1. Pila - Body Segmented, Mouth with radula - Mollusca
2. Asterias - Spiny Skinned, Water vascular system - Echinodermata
3. Sycon - Pore bearing, Canal system - Porifera
4. Periplaneta - Jointed appendages, Chitinous exoskeleton - Arthropoda

Correct answer: Pila - Body Segmented, Mouth with radula - Mollusca

Solution

Pila is a mollusc, and molluscs are not segmented; they do have a radula, but the segmentation clue is incorrect. The other three options correctly pair the genus with its key characters and phylum.

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