Question

Perception of colour is possible among:
A. Birds
B. Reptiles
C. Men
D. Both [a] and [c]

Answer 1

Hint:
Colour is an effective communication tool and can be used to signal action, affect mood, and even impact physiological reactions. Particular colours were associated with high blood pressure, increased metabolism, and visual fatigue. Colour perception includes a processing stream that contains colour-opponent responses in the retinal ganglion cells, opsin-containing cones in the retina, computations of colour contrast in the striate cortex, and a network of temporal regions that underlie the appearance of a stable colour percept.

Complete answer:
Colour perception in man is because of iodopsin pigment in cone cells. In the retina, there are three kinds of cones that react to green (chloropsin), red (erythropsin), and blue light (cyanopsin). Other colours are exposed by simultaneous stimulation of more than a single kind of cone cell.
Birds have extra colour cones in their retina that are sensitive to the ultraviolet range, so they view colours that are not visible to humans. Bird colour vision is dependent on opsins, ocular media, retinal mosaics, and oil droplets. Birds use spectral cues for phototaxis, circadian control, and magnetoreception. Birds have fine colour constancy and colour discrimination. Colour vision is distorted in dim light, and with diverse backgrounds.

Option ‘D’ is correct

Note:
Colour vision is the capability of the eyes to view and differentiate between colours based upon their different wavelengths in the visible. They are formed by the interpretation of the information received by the brain. The vision of colours is dependent on the visible spectrum, comprising the range of energy exposed by the photoreceptors. Additionally, colours are a psychological property of human sensory experience.