Which of the following is known as beet sugar? 

Sucrose 

The correct answer is option 1. Sucrose.

Beet sugar, also known as sucrose, is a type of sugar extracted from sugar beets (Beta vulgaris). Sucrose is a disaccharide, meaning it consists of two simple sugar molecules linked together. In the case of sucrose, it is composed of one molecule of glucose and one molecule of fructose.

The process of obtaining beet sugar involves harvesting sugar beets, extracting the sugar from the beets, and refining it into the crystalline form we commonly use. The sugar beet contains a high concentration of sucrose in its taproot, and through processing, this sucrose is separated and purified.

Sucrose is a common sweetener used in various food products and is chemically indistinguishable from the sucrose obtained from sugarcane. It is widely used in the food industry and as a sweetening agent in households.