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B
Tentaculocyst
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C
Nematocyst
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D
Otolith
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Solution
The correct option is D Tentaculocyst Aurelia possesses sensory organs that allow them to detect light, chemicals, and touch. The margin of the umbrella portion of the jellyfish consists of Tentaculocyst or hollow tentacles. These tentaculocysts consist of greatly modified and reduced tentacle containing a cavity with lithites (a calcareous concretion) and often being sunk in a pit or enclosed in a pouch. These also have a pad of ciliated sensory epithelial cells that help in sensory functions.