Trichocyst and nematocyst are meant for what purpose?

Options :
  1. excretion and osmoregulation
  2. reproduction
  3. defence
  4. locomotion and movement
Answer and Explanation :-

Answer: Option 3


Trichocyst and nematocyst release toxins,which is used to kill prey,thus used in defence mechanism

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She had stayed home and worked hard and a posthumous recognition had eventually followed. Not that Buck hadn't worked hard, sure he did, but in the end the body won't hold up as a work of art.
-Duff Brenna The Altar of the Body: A Novel