Question

Apposition image is formed in the eye of insect
A. Aedes
B. Culex
C. Musca
D. Periplaneta

Answer 1

The apposition image is the feature of the compound eye of the diurnal insects. The image of the apposition is clear on each ommatidia. In this intensity of light is high and the sheath of iris pigment remains intent. The rod cells in the apposition compound eye act as a detector. This helps in measuring the brightness of a small region of space.

Complete answer: There are two types of images in the compound eye which are named as apposition and superimposed. Each ommatidium catches up the rays which are parallel in the apposition compound eye. It is present in the diurnal insects. Each ommatidium catches up the rays in a wide range which is called a superimposed compound eye. It is present in the nocturnal insects.
Musca is a diurnal insect that forms an apposition image. The common name of Musca is the housefly. It is used in the research laboratory for identifying aging and sex determination. Musca is a diurnal insect so it will focus and form an apposition image in the bright light only.
The nocturnal mosquito is named Aedes which will form a superimposed image.
Culex is again a nocturnal mosquito which will form a superimposed image.
Periplaneta also forms a superimposed image because it is a nocturnal mosquito.
So, the correct answer is “Option C”.

Additional Information:
A compound eye consists of a network of minute lenses called ommatidia and this type of lenses will help in the image formation of either apposition or superimposed. The sharpness of the superimposed image becomes low in the bright light. In the superimposed compound eye, the image may also overlap.

Note:
Thus, the apposition image is formed by the diurnal insects and in the bright light. The sharpness of the image will increase in the bright light. So things will be visibly brighter and clearer. The diurnal insects awake in the bright daylight and are more active when their body is heated by the sun whereas nocturnal insects usually awake in the night dim light and survive on the stored body energy.