[[1]] is the basic unit in the eye of cockroaches.

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Detailed Solution

Concept- Ommatidium is the basic unit in the eye of cockroaches. Arthropods, including insects, crabs, and millipedes, have compound eyes made up of parts called ommatidia. In an ommatidium, a cluster of photoreceptor cells is surrounded by a collection of pigment and support cells.
Compound eyes are another name for ommatidia. Photoreceptor cells with pigment make up this structure. These are found as cell clusters. The combination of all ommatidia components produces a complete image. The cornea protects the ommatidia.
Hence, the correct answer is Ommatidium.

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