A red flower looks black in the evening because of

Change in flower colour

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Functioning of rods only

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Beginning of colour blindness

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Absence of cones

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Solution

The correct option is B Functioning of rods only
The retina of eye has two types of photoreceptor cells: rods and cones.
Rods are the photoreceptor cells that contain rhodopsin pigment and associated with scotopic vision of eye i.e. vision under low light.
Cones are the photoreceptor cells that contain iodopsin, porpyrosin and cyanopsin pigments. These cells are associated with the daylight vision and colour vision of eyes.
Since, there is no light in the evening time so under low light conditions, cones of the retina will not function and only rods will function due to which no colour vision will be possible and the red flower will look black.
So, the correct answer is 'Functioning of rods only'.

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