(D) Nematoblasts (also known as $cnidoblasts$) are specialized cells found in $Hydra$. They are sensory in nature,as they respond to external stimuli.

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(D) Nematoblasts (also known as $cnidoblasts$) are specialized cells found in $Hydra$. They are sensory in nature,as they respond to external stimuli. They contain a complex structure called the nematocyst apparatus,which is used for prey capture,offence,and defence.