Question

Ommatidia serve the purpose of photo reception in

• A. cockroach
• B. frog
• C. molluscs
• D. humans

Answer 1

Answer: (A)

cockroach

Answer 2

In insects like cockroach, each separate visual unit is a compound eye. These are black kidney shaped organs situated on the lateral side of head. Each consists of about $2000$ to $2500$ units called Ommatidium, which serve the purpose of photoreception.