Ques. 1AIPMT 2001
When we migrate from dark to light, we fail to see for some time but after a time visibility becomes normal. It is an example of
- accommodation
- adaptation
- mutation
- photoperiodism
Answer
(2) adaptation
Solution
On moving from dark to bright light, the eye is at first dazzled; then the pupil constricts and the photopigments of rods are bleached, so the retina adjusts to the higher light intensity and vision becomes normal (light adaptation).
Accommodation is the change of focal length of the lens for near and far objects, so it is not involved here.
∴ It is an example of adaptation.
Answer: (2)
Out of syllabus