Question

The figures (A) and (B) given below are showing some kind of adjustment. Study the figures and answer the questions that follow.

A

B

1. Identify the kinds of adjustments done in the figures (A) and (B).
2. Distinguish between the adjustments of figures (A) and (B) on the basis of:
   1. The size of pupil.
   2. The pigment which gets regenerated.
   3. Cells of the retina.

Answer 1

1. The kind of adjustments done in Figure (A) is dilated pupil due to dim light.
   The kind of adjustments done in Figure (B) is constricted pupil due to bright light.
2.      
   1. In the case of A, the pupil dilates to allow more light into the eyes.
      In case B, the pupil constricts, reducing the amount of light entering the eyes.
   2. Case A involves the regeneration of visual purple or rhodopsin.
      Case B involves the regeneration of cone cells or iodopsin.
   3. Rod cells become activated and begin producing rhodopsin.
      Cone cells become activated and begin producing iodopsin.