Question

Through mosaic vision, a cockroach can receive
A. Several images of an object with more sensitivity but less resolution
B. Only one image of an object with more sensitivity but less resolution
C. Several images of an object with less sensitivity but more resolution
D. Only one image of an object with less sensitivity but more resolution
E. Only one image of an object with less sensitivity but less resolution

Answer 1

The eyes of cockroach are compound eyes consisting of a large number of visual elements or ommatidia. Each ommatidium is capable of producing separate images of several parts of the object giving mosaic vision which is of low quality.

Complete answer:
Option (A) is correct. The eyes of cockroaches are compound eyes that are made up of about 2000 units of small eyes or ommatidia which results in several images that are of low resolution but with high sensitivity. Therefore, this option is correct because, through mosaic vision, a cockroach can receive several images of an object with more sensitivity but less resolution.
Option (B) is incorrect. Through mosaic vision, a cockroach can receive several images but not only one image of an object because the compound eyes of cockroach consist of small eyes that will form several images of an object.
Option (C) is incorrect. Several images produced by the compound eyes of cockroaches through mosaic vision have more sensitivity but less resolution.
Option (D) is incorrect. The eyes of cockroaches are compound eyes consisting of small eyes and each small eye will form an image of the object thereby forming several images of an object having low resolution.
Option (E) is incorrect. Through mosaic vision, a cockroach can receive several images of an object but not only one image, and also the sensitivity is more but the resolution of the image is less.

Hence, the correct answer is option (A).

Note: The term mosaic can be defined as a pattern produced by arranging together small pieces of objects. Thus, the compound eyes of cockroaches give mosaic vision which implies that the cockroach can receive several images of an object with less resolution but more sensitivity.