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Which of the following causes night blindness?
ACalcium deficiency
BVitamin C deficiency
CVitamin A deficiency
DLack of sleep
Answer & Solution
Correct answer: C. Vitamin A deficiency
1. The retina contains photoreceptor cells called rods and cones.
2. Rods give vision in dim light and depend on vitamin A.
3. Vitamin A deficiency reduces the rod cells' ability to detect dim light.
4. The person then cannot see well at night, called night blindness.
5. So vitamin A deficiency causes night blindness.
_Source: NCERT Class 10 Science Ch 11 'Human Eye and the Colourful World'_
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