Read the passage carefully and answer.
Carbohydrates are essential for both plants and animals. Some common examples of carbohydrates are glucose, fructose, sucrose, glycogen, cellulose and starch. They form a major portion of our food. Honey has been used for a long time as an instant source of energy in Ayurvedic medicine. Carbohydrates are used as storage molecules in both plants and animals. The cell wall of bacteria and plants is made of cellulose. We use cellulose in the form of wood for making furniture and as cotton fiber for clothing. They also provide raw material for textiles, paper, lacquers, and breweries. Carbohydrates are classified as Monosaccharides, Oligosaccharides and Polysaccharides on the basis of their behavior towards hydrolysis. Monosaccharides cannot be hydrolyzed further to simpler units whereas oligosaccharides can yield 2-10 units of monosaccharides on hydrolysis. Polysaccharides, which are non-sugars yield a large number of monosaccharide units on hydrolysis.
Answer the following questions about carbohydrates:
Pick the incorrect statement from the following:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Amylopectin contains only 1,3-glycosidic linkage
Amylopectin has two kinds of glycosidic linkage, C1–C4 in the chains and C1–C6 at the branches, and no 1,3-linkage at all.
Option (1) Amylopectin contains only 1,3-glycosidic linkage — Not true for amylopectin (it has C1–C4 and C1–C6 links). There is no 1,3-glycosidic linkage in amylopectin.
Option (2) Amylopectin is insoluble in water — True for amylopectin. Amylose is the water soluble component; amylopectin does not dissolve.
Option (3) Amylopectin is the major constituent of starch — True for amylopectin. It makes up about 80–85% of starch, against 15–20% for amylose.
Option (4) Amylopectin has a branched chain structure. — True for amylopectin. The C1–C6 linkages start the branches.
NCERT (2026-27 edition):
Starch
