Nematocysts are activated by

Water

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Touch

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Brain

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None of the above

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Solution

The correct option is C Touch
A variety of mechanical and chemical stimuli can cause the nematocysts that are enclosed in the cnidocysts/cnidoblasts that respond to incoming prey or danger to get activated. The whip-like hollow tubule nematocyst lies coiled under high osmotic pressure. The mechanical stimuli/touch triggers to change its potential and allows the neurotoxin release.
So, the correct answer is 'Touch'.

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