Question

Sugar obtained from sugarcane and sugar beet is
A)Glucose
B)Fructose
C)Galactose
D)Sucrose

Answer 1

Hint: The plants produce food in the form of carbohydrates. Carbohydrates are the saccharides or sugar. The plants store food in the form of starch which is a polymer of glucose and fructose.

Complete answer:
To solve this question, we must know about the different sugar molecules and their occurrence naturally.

Glucose- It is the most abundant monosaccharide. It is produced by plants and algae by the process of photosynthesis. It is the instant source of energy in all organisms. The glucose is metabolised and is stored as starch in plants.

Fructose-It is known as fruit sugar. It is a simple monosaccharide. It binds with glucose to form sucrose. It is an alternate source of energy.

Galactose- Galactose is a monosaccharide sugar. It is sweet as glucose and sucrose. It is found in dairy products, avocados. It is also synthesised by the human body. It links with glucose molecules to form lactose.

Sucrose- It is the commonly found sugar in plants. The carbohydrate which is transported from one organ to another is in the form of sucrose. It is composed of monosaccharides-glucose and fructose. The sugar obtained from sugarcane and sugar beet is in the form of sucrose. It is also known as table sugar which we normally consume.

The sucrose is extracted from the sugarcane or sugar beet in the sugar mills. The raw sugar thus obtained is refined in the factories and pure sucrose is obtained.

Hence, the correct answer is option (D)

Note: The other sources of sucrose in plants are in roots, fruits, nectar. The honeybee accumulates sucrose and makes honey. The fruits like grapes, cherries, berries, fig, tomato, lemons, avocados, limes are rich in sucrose.