Question

In insects, the nocturnal vision is
A. Mosaic
B. Apposition
C. Superposition
D. Both A & B

Answer 1

Hint: Insects have much better eye vision as compared to humans. As they have two types of eyes, those are ‘compound eyes’ and ‘simple eyes ’. Although both the eyes perform the same function despite being structurally very different by splitting up the light which is coming according to its direction of its origin.

Complete answer:
The compound eye of an insect has approximately 2000 ommatidia which is in the form of a cluster containing photoreceptor cells which are then supported by pigment and support cells. Nocturnal vision is well explained if we study about the cockroach in the insect's category. As a result of these much ommatidia it revives so many images at a time that eventually creates the mosaic vision which is less resolution but has high sensitivity which makes the image blur but detects the movement fast. This vision is called nocturnal as it is most common at night. Brain supplies nerves to antennae and compound eyes. Compound eyes are made up of apposition eyes and superposition eyes, the apposition eye has a receptor cluster which has its own lens whereas a superposition eye image formed on any point of retina is the product of many lenses. But here we are talking about nocturnal vision which is kind of another name for mosaic.

Hence, the correct answer is (A) Mosaic.

Note:
Insects see the world in much finer way as compared to we humans, by above discussion we can conclude that an insect has two sets of eyes which contains many lenses which is also responsible for nocturnal vision but on other hand it also helps them to detect any movement nearer to them which is helpful for them to escape from the deadly situations around them.