The inadequacy of which of the micronutrients can lead to colour blindness in the human beings ?
Vitamin-A
Vitamin A is a fat-soluble micronutrient that forms retinal, a part of the visual pigments in the retina: rhodopsin in rods and the iodopsin pigments in cones.
Cones are responsible for colour vision, so inadequate vitamin A impairs the photopigments and the ability to perceive colours properly, along with night blindness and xerophthalmia.
Iodine deficiency causes goitre and cretinism, and chlorine is linked to fluid and acid–base balance; neither affects colour perception.
Hence, the answer is Vitamin-A.
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