What is an Ommatidium?

Options :
  1. Gland producing defensive ink in squids
  2. Single unit of the compound eye of insects
  3. Locomotory organs of annelids
  4. A pre-historic extinct invertebrate
Answer and Explanation :-

Answer: Option 2

Explanation:

Ommatidum is a single unit of the compound eye of insects, mantis, shrimps and millipedes which consists of a cluster of photoreceptor cells surrounded by support cells and pigment cells.

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