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AIIMS2001BotanyAnimal Kingdom

Which of the following is correct about nematocyst?

Options

  1. AIt can be re-used.
  2. BIt is excretory organ in arthropods
  3. CIt is ejected on contact and pierce the prey.
  4. DNone of these.

Correct answer

C. It is ejected on contact and pierce the prey.

Step-by-step solution

Nematocysts are the stinging cells and are the organs of offence and defence of coelenterates, Nematocyst contains a poisonous proteinaceous fluid hypnotoxin along tube which injects the fluid into the victim. Nematocysts are activated in response to chemicals secreted by prey. They explode after coming in contact with the prey.

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