What role does the shape of rods and cones play in their fucntions as photoreceptors

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​Please find below the solution to the asked query                                                                   

Shape of rod cell in the eyes play following significant roles:
  • Because of their shape, they have large number of stacked disks (storehouse for photopigments) in their outer membrane which make them store more photopigments. More photopigment means more sensitivity towards light and an ability to work better in less intense light. Hence, shape of rod cells make them sensitive to light more than the cone cells.
  • Also, these respond to a single photon of light.
Cone cells contain less stacked disks in their outer membrane and so have less photopigments. Hence, they are less sensitive to light.

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