Which vitamin deficiency causes Night blindness?

Last Updated: 26 Jun 2026

Questions may also test blood components, vitamins, glands, sense organs, communicable diseases, and deficiency disorders. A familiar word is not automatically correct; qualifiers such as “largest,” “primary,” “deficiency,” “secreted by,” “carries,” or “controls” determine the answer.

AVitamin C

BVitamin D

CVitamin A

DVitamin B12

Correct Answer: Vitamin AYour Answer: C

Explanation

Vitamin C is incorrect because it refers to a different organ, substance, process, or medical association. Vitamin D is also incorrect; it may be biologically important, but its principal role or defining feature is not the one being tested here. Vitamin B12 is incorrect because its function, source, target, or disease relationship does not match the question. Then recall the exact source–function or deficiency–disorder pair and eliminate neighbouring concepts. Do not confuse an organ that produces a substance with an organ on which that substance acts, or a vector with the organism that causes a disease. Therefore option C, Vitamin A, is factually consistent with the stem, the marked correct index, and the explanation. Vitamin A (retinol) deficiency causes night blindness as it is essential for formation of rhodopsin (visual pigment) in rod cells of retina.

Important Notes

s record is Vitamin A, corresponding to option C. The answer field, correct index, and both explanations must remain aligned.
Read the complete stem and identify the exact demand: organ, gland, hormone, cell, tissue, nutrient, enzyme, pathogen, vector, deficiency disease, body fluid, or physiological function.
Learn nutrition facts as nutrient–source–function–deficiency pairs. Vitamins and minerals can have several roles, but SSC questions usually ask the best-known primary association.
Vitamin C, Vitamin D, Vitamin B12 are eliminated here because none satisfies the precise requirement of the stem. Practising the reason for each rejection is more reliable than memorising only the correct choice.

Test your SSC CGL Human Body knowledge

Start Topic Test

FAQ

SSC CGL Human Body FAQs

Common questions and clear answers for this topic.

Which body systems are most important for SSC CGL preparation?

The digestive, circulatory, nervous, and skeletal systems appear most frequently, along with sensory organs and basic endocrine functions.

How many bones are there in the human body, and is this commonly asked?

Yes, the human body has 206 bones, and questions about the largest, smallest, and total bone count appear fairly often.

What kind of blood-related questions come up in SSC CGL?

Questions usually cover blood group compatibility, the role of platelets in clotting, and basic facts about blood pressure and heart function.

Do I need detailed biochemistry knowledge for the human body section?

No, most questions focus on what each organ does and why, rather than the detailed biochemical processes behind it.

How can I retain human body facts more effectively for the exam?

Linking facts to real-life observations, like why pulse is checked at the wrist, makes them easier to recall than memorizing textbook lines.

Same Topic MCQs

View All

Which substance is responsible for the transmission of nerve impulses at synapses?The human eye can distinguish approximately how many colors?Which part of the brain regulates body temperature?