Question

Which sugar is known as milk sugar?
${\text{A}}{\text{.}}$ Maltose
${\text{B}}{\text{.}}$ Lactose
${\text{C}}{\text{.}}$ Glucose
${\text{D}}{\text{.}}$ Fructose

Answer 1

Hint- Here, we will proceed by defining the term carbohydrates and then, we will classify these into simple and complex. Further, we discuss the classification of simple carbohydrates and discuss all the sugars mentioned in the options of the problem.

Complete answer:
Carbohydrates are one of three basic macronutrients needed to sustain life (the other two are proteins and fats). They are found in a wide range of foods that bring a variety of other important nutrients to the diet, such as vitamins and minerals, phytochemicals, antioxidants, and dietary fibres.
The two major types of carbohydrates are simple and complex. The difference between them lies in the number of sugar molecules they contain.
Simple carbohydrates also known as simple sugars contain one or two sugar molecules, whereas complex carbohydrates have three or more sugar molecules.
Simple carbohydrates are classified as monosaccharides and disaccharides.
Monosaccharides- Monosaccharides are the simplest carbohydrates that the body cannot break down further.
Glucose- Glucose are monosaccharides. Fruits and vegetables are the natural sources of glucose. It’s also commonly found in syrups, candy, honey, sports drinks, and desserts.
Fructose- Fructose are monosaccharides. The primary natural dietary source of fructose is fruit, which is why fructose is commonly referred to as fruit sugar.
Disaccharides- Disaccharides consist of two sugar molecules or two monosaccharides that are bonded together.
Lactose (glucose + galactose): These types of disaccharides are also known as milk sugar because lactose is found in milk and milk products.
Maltose (glucose + glucose): These types of disaccharides are found in malt beverages, such as beer and malt liquors.
Therefore, lactose sugar is known as milk sugar.
Hence, option B is correct.

Note- Galactose are monosaccharides whose main dietary source is lactose, the sugar in milk and milk products, such as cheese, butter, and yogurt. Sucrose (glucose + fructose) are disaccharides which are also called table sugar and are a natural sweetener derived from sugarcane or beet.