Question

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A) : With the help of several ommatidia, a cockroach can perceive several images of an object, ie, mosaic vision.

Reason (R) : Mosaic vision gives more sensitivity but less resolution.

In the light of the above statements, choose the most appropriate answer from the option given below :

• A. (A) is not correct but (R) is correct
• B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• C. Both (A) and (R) are correct but (R) is not the correct explantation of (A)
• D. (A) is correct but (R) is not correct

Answer 1

Answer: (C)

Both (A) and (R) are correct but (R) is not the correct explantation of (A)

Answer 2

Analyzing Assertion (A): Cockroaches possess compound eyes composed of numerous ommatidia. Each ommatidium perceives a small portion of the visual field. The brain combines these partial images to form mosaic vision. Thus, Assertion (A) is correct.

Analyzing Reason (R): Compound eyes are effective at detecting movement and are sensitive to light (high sensitivity). However, the resolution is lower compared to single-lens eyes. Thus, Reason (R) is also correct.

Evaluating the Relationship: Assertion (A) describes what mosaic vision is. Reason (R) describes the functional properties of mosaic vision. Reason (R) does not explain why mosaic vision involves perceiving several images, but rather the advantages and disadvantages of the system.

Therefore, both Assertion (A) and Reason (R) are correct, but Reason (R) is not the correct explanation for Assertion (A).