The unit of photo reception, in a compound eye of cockroach and other insects, is

Ctenidium

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Osphradium

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Ommatidium

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Rhabdom

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Solution

The correct option is C Ommatidium
Arthropod eyes are made up of repeating units of the ommatidia, each of which functions as a separate visual receptor. It contains a cluster of photoreceptor cells surrounded by support cells and pigment cells.
So, the correct answer is option C.

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