Monosaccharides are the simplest form of sugar that are building blocks to form complex carbohydrates. Glucose and fructose are examples of monosaccharides. The main function of monosaccharides is to produce and store energy. Hence, option a is incorrect.
A disaccharide has two glucose molecules joined via a glycosidic bond. Maltose is an example of a disaccharide. It has a major role in digestion where starch is broken down to intermediate maltose by the pancreatic enzymes. Maltose is absorbed by the body and broken down into glucose by the maltase enzyme in the intestine. Hence, option b is incorrect.
Lipids are a class of organic compounds that are insoluble in polar solvents and soluble in organic solvents. They include fats, waxes, hormones, oils, and also form an important component of the plasma membrane. Fatty acids are the building blocks of lipids. Hence, option c is incorrect.
A polysaccharide consists of many monosaccharide monomers linked together by glycosidic linkages. They play an important role in providing support, storage, and cell communication. Cellulose is the most abundant polysaccharide that provides strength and support to the plant. Starch is a polysaccharide that acts as an energy storage reserve in plants. Hence, option d is correct.
