Nematocysts are activated by

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(B) Nematocysts are specialized stinging organelles found in the cells called cnidocytes,which are characteristic of the phylum $Cnidaria$. These orga

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Touch

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(B) Nematocysts are specialized stinging organelles found in the cells called cnidocytes,which are characteristic of the phylum $Cnidaria$. These organelles are activated by mechanical stimulation of the cnidocil (a sensory hair-like structure). When an object touches the cnidocil,it triggers a rapid change in the permeability of the nematocyst membrane,leading to the discharge of the thread-like tubule. Therefore,touch is the primary stimulus for the activation of nematocysts.

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