Name: Why Do Earthworms Come Out After It Rains?
Uploaded: 2019-07-19
Duration: 1 min 46 s
Description: Scientists come up with many possible reasons why rain triggers earthworms' mysterious behavior: popping out of the soil and getting stranded on the ground. Let's find out.

Question

Arthropod eyes are called compound eyes because they are made up of repeating units, the ommatidia, each of which functions as a separate visual receptor. What is the difference between compound eyes and simple eyes? Why is mosaic vision with less resolution seen in cockroaches.

Accepted Answer

Arthropod eyes are called compound eyes because they are made up of repeating units, the ommatidia, each of which functions as a separate visual receptor.

The difference between compound eyes and simple eyes is given as follows:

Features Compound eyes Simple eyes

Eye units Compound eyes are made up of clusters of ommatidia. Simple eyes are made up of a single unit of eye.

Occurrence They are found in most of the arthropods, annelids and molluscs. They are found among many types of organisms including most of the higher vertebrates.

Coverage of vision They can cover a wider angle. They cannot cover a wider angle than compound eyes.

Polarisation The polarisation of sunlight could be understood via compound eyes. The polarisation of sunlight could not be understood by these eyes.

Cockroaches have a compound eye which is made up of up to 2000 units of small eyes called ommatidia. As a result of so many units, the cockroach receives several images at a time and therefore it creates a mosaic vision which is with less resolution but high sensitivity.

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