[Campbell Biology P.741] Which of the following best describes the function of a cnidocyte i... | Practice Question

Which of the following best describes the function of a cnidocyte in a hydra, according to the provided text?

  • A: To digest food particles within the gastrovascular cavity.
  • B: To sense changes in light and temperature in the environment.
  • C: To capture prey by puncturing and injecting poison using a coiled thread.
  • D: To facilitate locomotion through coordinated muscle contractions.

Explanation

The text explicitly states: 'This type of cnidocyte contains a stinging capsule, the nematocyst, which contains a coiled thread. When a 'trigger' is stimulated by touch or by certain chemicals, the thread shoots out, puncturing and injecting poison into prey.' This directly describes the function of capturing prey by injecting poison.