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

(a) Identify the kinds of adjustments done in the figure (A) and (B).
(b) Distinguish between the adjustments of figures (A) and (B) on the basis of :
(i) The size of pupil.
(ii) The pigment which gets regenerated.
(iii) Cells of the retina.
Sense Organs
89 Likes
Answer
(a) Kinds of adjustments done in the figure:
(A) → dilated pupil due to dim light.
(B) → Constricted pupil due to bright light.
(b)
S. No. | Factor | A | B |
---|---|---|---|
(i) | The size of pupil | bigger | smaller |
(ii) | The pigment which gets regenerated | Rhodopsin (visual purple) | Iodopsin. |
(iii) | Cells of the retina | Rods become active and cones become inactive | Cones become active and rods become inactive |
Answered By
51 Likes
Related Questions
By closing the eyes and gently pressing them with your palms, you may see some specs of brilliant light. How do you get this sensation while there is no light entering your eyes?
Name the three ear ossicles. How do they contribute in the mechanism of hearing?
With reference to human eye and ear answer the questions that follow :
(a) Name the parts of the eye associated with:
(i) Regulation of the size of pupil.
(ii) Regulation of the shape of lens.
(iii) Keeping the lens moist and protecting it from physical shock.
(iv) The layer providing nourishment to the eye.
(b) Name the part of the ear associated with :
(i) Static balance.
(ii) Dynamic balance.
(iii) Hearing.
(iv) Amplification of vibrations.
The figure given below refers to the vertical section of the eye of a mammal. Study the figure carefully and answer the following questions.
(a) Label the guidelines shown as 1 to 10.
(b) Write one important role of parts shown as 3 and 7.
(c) Write one structural difference between the parts shown as 9 and 10.
(d) Mention one functional difference between the parts shown as 6 and 8.