Question

Write about compound eyes of cockroaches.

Answer 1

Compound eyes of cockroaches:

1. Cockroaches are nocturnal organisms, which means that they are active during the night time.
2. In such organisms, images are formed by the overlapping of images and thus a blurred image is obtained.
3. Compound eyes are the visual structures observed in the arthropods.
4. A cockroach has compound eyes located on the lateral sides of the head, each in the form of a dark kidney-shaped structure formed of around 2000 hexagonal units called the ommatidia or simple eyes.
5. Each ommatidium of a compound eye forms a part of the image of an object which is along its optical line.
6. All the images formed, are then combined together in the brain and form a single image.
7. Such a type of vision is called mosaic vision.
8. The image formed is visible deep below the vitrellae and the crystalline cone.
9. They have superpositioned eyes in which the ommatidia are not distinct from one another by pigments.