Answer the question on the basis of passage given below:
Proteins are the polymers of about twenty different \(\alpha \)-amino acids which are linked by peptide bonds. Proteins perform various structural and dynamic functions in the organisms. Proteins which contain only \(\alpha \)-amino acids are called simple proteins. The secondary or tertiary structure of proteins gets disturbed on change of pH or temperature and they are not able to perform their functions. This is called denaturation of proteins. Enzymes are biocatalysts which speed up the reactions in biosystems. Vitamins are accessory food factors required in the diet. They are classified as fat soluble (A, D, E and K) and water soluble (B group and C). Deficiency of vitamins leads to many diseases. Nucleic acids are the polymers of nucleotides which in turn consist of a base, a pentose sugar and phosphate moiety. Nucleic acids are responsible for the transfer of characters from parents to offspring. There are two types of nucleic acids – DNA and RNA. DNA contains a five carbon sugar molecule called 2-deoxyribose whereas RNA contains ribose.
Which of the following vitamin cannot be stored in our body?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Vitamin \(B_2\)
Vitamins are classified by their solubility, which decides whether the body can store them:
Fat soluble vitamins (A, D, E and K) are stored in the liver and adipose (fat storing) tissues.
Water soluble vitamins (B group and C) are readily excreted in urine and cannot be stored in the body, so they must be supplied regularly in the diet. The one exception is vitamin B12, which can be stored.
Vitamin B2 (riboflavin) is a water soluble B vitamin other than B12, so it cannot be stored in the body.
Why the other options are incorrect
Option (1) Vitamin D — Incorrect. Fat soluble; it is stored in the liver and adipose tissue.
Option (2) Vitamin \(B_{12}\) — Incorrect. Water soluble, but it is the one vitamin of this group that can be stored in the body.
Option (3) Vitamin K — Incorrect. Fat soluble; it is stored in the liver and adipose tissue.
NCERT (2026-27 edition):
Water Soluble Vitamins
