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Q. No.The structure marked ‘X’ in the given diagram is:
| 1. | used in generating water current in sponges |
| 2. | a cell used for capturing prey in Cnidarians |
| 3. | a sticky cell used for anchorage in comb jellies |
| 4. | an excretory and osmoregulatory cell in flatworms |
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Subtopic: Phylum Platyhelminthes |
Level 3: 35%-60%
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