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B
They are distasteful.
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C
They lack glutathione.
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D
None of the above
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Solution
The correct option is B They lack glutathione. Hydra is carnivore and feeds on nematodes, crustaceans etc. The feeding mechanism is majorly stimulated by release of Glutathione (GSH) by the injured prey when pierced by a nematocyst.
So, the correct answer is 'They lack glutathione.'