Differentiate between rod cells and cone cells.

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Rod cells Cone cells
$(1)$ These are rod-shaped photoreceptor cells. $(1)$ These are cone-shaped photoreceptor cells.
$(2)$ They contain the photopigment rhodopsin (visual purple). $(2)$ They contain photopigments known as iodopsins.
$(3)$ They are responsible for scotopic vision (vision in dim light). $(3)$ They are responsible for photopic vision (daylight vision) and colour vision.
$(4)$ They are highly sensitive to light but do not provide colour information. $(4)$ They are less sensitive to light but provide sharp images and colour discrimination.

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