Hydra receives impulses and stimuli through

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(D) $Hydra$ possesses a primitive nervous system consisting of a nerve net composed of interconnected neurons. Sensory cells are distributed throughou

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All of these

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(D) $Hydra$ possesses a primitive nervous system consisting of a nerve net composed of interconnected neurons. Sensory cells are distributed throughout the epidermis to detect environmental stimuli. $Nematocytes$ (or $Cnidocytes$) are specialized cells that contain stinging organelles and also function as sensory receptors to trigger the discharge of the nematocyst in response to external stimuli. Therefore,all these structures contribute to the reception of impulses and stimuli in $Hydra$.

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