Answer 1

	Rods	Cones
1	Rods help in twilight vision.	Cones help in colour vision.
2	They have visual purple pigment called rhodopsin.	They have visual violet pigment called iodopsin
3	Rods are the photoreceptor cells of the retina that are sensitive to dim light.	Cones are the photoreceptor cells of the retina that are sensitive to bright light.