Hydra recognizes its prey by

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(B) Hydra is a predatory organism that captures its prey using specialized cells called cnidocytes,which contain nematocysts.However,the initial recog

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Chemical stimulus

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(B) Hydra is a predatory organism that captures its prey using specialized cells called cnidocytes,which contain nematocysts.However,the initial recognition of the prey is triggered by chemical stimuli.When the prey comes in contact with the tentacles of the $Hydra$,the chemical substances released by the prey are detected by the sensory cells on the tentacles,which then trigger the discharge of the nematocysts to capture the prey.

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