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easyQ. No. 16193

Deficiency of vitamin A most characteristically causes which condition?

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This question tests a core concept of human nutrition: Vitamin A deficiency impairs formation of visual pigments and classically causes night blindness, which can progress to xerophthalmia. Understanding this relationship helps explain how the body obtains energy, builds tissues, maintains immunity and prevents deficiency disease. The correct answer is Night blindness. Students should connect the nutrient with its principal function, common dietary sources and characteristic deficiency or excess. The other options represent real nutrients or disorders but do not match the exact function or condition asked here.

ANight blindness
BScurvy
CBeriberi
DRickets
Correct Answer: Night blindnessYour Answer: A

Explanation

Correct answer: Night blindness. Vitamin A deficiency impairs formation of visual pigments and classically causes night blindness, which can progress to xerophthalmia. Vitamin A also supports epithelial integrity, immunity, growth and reproduction; severe deficiency may damage the cornea. Scurvy results from vitamin C deficiency, beriberi from thiamine deficiency and rickets mainly from vitamin D deficiency. The distractors are related to nutrition, but each describes a different nutrient, function, energy value or deficiency condition.

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Nutrition FAQs

Common questions and clear answers for this topic.

What nutrients does the human body need?

The body needs carbohydrates, proteins, fats, vitamins, minerals and water. Dietary fibre also supports digestive and metabolic health. A balanced diet supplies these components in amounts suited to a person’s age, activity and physiological needs.

Which nutrition facts are commonly tested in competitive exams?

Competitive exams commonly test nutrient functions and sources, energy values, vitamin and mineral deficiencies, fat-soluble and water-soluble vitamins, balanced diets, and protein-energy malnutrition such as kwashiorkor and marasmus.

How should nutrient-deficiency questions be revised?

Learn each nutrient as a four-part link: its major dietary sources, principal function, characteristic deficiency and important excess effect. This method makes similar options easier to distinguish.

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