Question

Ommatidia serve the purpose of photoreception in (a) cockroach (b) frog (c) humans (d) sunflower

Ommatidia serve the purpose of photoreception in

(a) cockroach

(b) frog

(c) humans

(d) sunflower

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Answer #1

(a) Cockroach

The compound eyes of arthropods like insects, crustaceans and millipedes are composed of units called ommatidia(singular: ommatidium). An ommatidium contains a cluster of photoreceptor cellssurrounded by support cells and pigment cells. The outer part of the ommatidium is overlaid with a transparent cornea. Each ommatidium is innervated by one axon bundle and provides the brain with one picture element. The brain forms an image from these independent picture elements.

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