Consider the following statements about the importance of carbohydrates.
(A) Carbohydrates are used as storage molecules as starch in plants and as glycogen in animals.
(B) Two aldohexoses, D-ribose and 2-deoxy-D-ribose, are present in nucleic acids.
(C) The cell wall of bacteria and plants is made up of glycogen.
(D) Honey has been used for a long time as an instant source of energy by ‘Vaids’ in the ayurvedic system of medicine.
Which of the statements given above are correct? Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) and (D) only
Carbohydrates are essential for life in both plants and animals: they give energy, they are stored for later use, they build structures such as the cell wall, and two of them are parts of nucleic acids.
(A) Carbohydrates are used as storage molecules as starch in plants and as glycogen in animals. — True. Starch is the storage form in plants and glycogen in animals.
(B) Two aldohexoses, D-ribose and 2-deoxy-D-ribose, are present in nucleic acids. — False. Ribose and deoxyribose have five carbon atoms and an aldehyde group, so they are aldopentoses, not aldohexoses.
(C) The cell wall of bacteria and plants is made up of glycogen. — False. The cell wall is made up of cellulose; glycogen is a storage carbohydrate of animals.
(D) Honey has been used for a long time as an instant source of energy by ‘Vaids’ in the ayurvedic system of medicine. — True. Honey has long been valued as a quick source of energy.
NCERT (2026-27 edition):
10.1.5 Importance of Carbohydrates – “…Honey has been used for a long time as an instant source of energy by ‘Vaids’ in ayurvedic system of medicine. Carbohydrates are used as storage molecules as starch in plants and glycogen in animals. Cell wall of bacteria and plants is made up of cellulose.”
“Two aldopentoses viz. D-ribose and 2-deoxy-D-ribose … are present in nucleic acids.”