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Biomolecules

Vitamins and Biological Roles Practice Questions

19 free Vitamins and Biological Roles practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 19 Medium

Vitamins are best defined as:

  1. A Organic compounds required in small amounts
  2. B Direct and immediate sources of dietary energy
  3. C Structural proteins found within body cells
  4. D Essential inorganic salts and minerals

Correct answer: Organic compounds required in small amounts

Vitamins are organic compounds required in small quantities for normal metabolism. They do not provide energy but regulate physiological functions.

Question 2 of 19 Medium

Which vitamin is known as ascorbic acid?

  1. A Vitamin A
  2. B Vitamin B12
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin C

Vitamin C is also called ascorbic acid. It is important for immune function and collagen synthesis.

Question 3 of 19 Medium

Deficiency of vitamin D leads to:

  1. A Rickets
  2. B Scurvy
  3. C Night blindness
  4. D Beriberi

Correct answer: Rickets

Vitamin D deficiency causes rickets in children. It leads to weak and soft bones.

Question 4 of 19 Medium

Which vitamin is essential for vision?

  1. A Vitamin A
  2. B Vitamin B
  3. C Vitamin C
  4. D Vitamin K

Correct answer: Vitamin A

Vitamin A is necessary for the formation of visual pigments. Its deficiency leads to night blindness.

Question 5 of 19 Medium

Which vitamin helps in blood clotting?

  1. A Vitamin A
  2. B Vitamin C
  3. C Vitamin D
  4. D Vitamin K

Correct answer: Vitamin K

Vitamin K is essential for synthesis of clotting factors. Its deficiency can lead to excessive bleeding.

Question 6 of 19 Medium

Which vitamin deficiency causes scurvy?

  1. A Vitamin A
  2. B Vitamin B1
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin C

Scurvy is caused by deficiency of vitamin C. It leads to bleeding gums and poor wound healing.

Question 7 of 19 Medium

Which vitamin is known as the 'sunshine vitamin'?

  1. A Vitamin A
  2. B Vitamin B12
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin D

Vitamin D is synthesized in the skin in the presence of sunlight. It helps in calcium absorption.

Question 8 of 19 Medium

Which vitamin deficiency leads to beriberi?

  1. A Vitamin B1
  2. B Vitamin B12
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin B1

Beriberi is caused by deficiency of vitamin B1 (thiamine). It affects the nervous and cardiovascular systems.

Question 9 of 19 Medium

Which vitamin is important for red blood cell formation?

  1. A Vitamin A
  2. B Vitamin B12
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin B12

Vitamin B12 is essential for RBC formation. Its deficiency leads to anemia.

Question 10 of 19 Medium

Which vitamins are water-soluble?

  1. A Vitamin A and D
  2. B Vitamin B and C
  3. C Vitamin D and K
  4. D Vitamin A and K

Correct answer: Vitamin B and C

Vitamin B and C are water-soluble. They are not stored in the body and need regular intake.

Question 11 of 19 Medium

Which vitamins are fat-soluble?

  1. A Vitamin B and C
  2. B Vitamin A, D, E, K
  3. C Vitamin C only
  4. D Vitamin B12 only

Correct answer: Vitamin A, D, E, K

Vitamins A, D, E, and K are fat-soluble. They can be stored in body tissues.

Question 12 of 19 Medium

Which vitamin acts as an antioxidant?

  1. A Vitamin A
  2. B Vitamin E
  3. C Vitamin D
  4. D Vitamin K

Correct answer: Vitamin E

Vitamin E acts as an antioxidant. It protects cells from oxidative damage.

Question 13 of 19 Medium

Which vitamin is involved in collagen synthesis?

  1. A Vitamin A
  2. B Vitamin B
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin C

Vitamin C is essential for collagen formation. It maintains skin and connective tissue health.

Question 14 of 19 Medium

Which vitamin deficiency causes night blindness?

  1. A Vitamin A
  2. B Vitamin B1
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin A

Vitamin A deficiency impairs vision in dim light. This condition is called night blindness.

Question 15 of 19 Medium

Which vitamin is required for calcium absorption?

  1. A Vitamin A
  2. B Vitamin B
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin D

Vitamin D enhances calcium absorption in the intestine. It is crucial for bone health.

Question 16 of 19 Medium

Which vitamin deficiency leads to anemia?

  1. A Vitamin A
  2. B Vitamin B12
  3. C Vitamin C
  4. D Vitamin D

Correct answer: Vitamin B12

Vitamin B12 deficiency leads to anemia. It affects red blood cell production.

Question 17 of 19 Medium

Which vitamin is essential for maintaining epithelial tissues?

  1. A Vitamin A
  2. B Vitamin B
  3. C Vitamin C
  4. D Vitamin K

Correct answer: Vitamin A

Vitamin A maintains epithelial tissues and skin. It also supports vision and immune function.

Question 18 of 19 Medium

Which vitamin is synthesized by gut bacteria?

  1. A Vitamin A
  2. B Vitamin C
  3. C Vitamin D
  4. D Vitamin K

Correct answer: Vitamin K

Vitamin K is produced by intestinal bacteria. It plays a role in blood clotting.

Question 19 of 19 Medium

Which of the following is a characteristic of vitamins?

  1. A Provide energy
  2. B Act as enzymes
  3. C Act as coenzymes
  4. D Store genetic information

Correct answer: Act as coenzymes

Vitamins often act as coenzymes in metabolic reactions. They are essential for enzyme function.

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