Question

The general formula of starch is
A) $(C_6H_5O_6)n$
B) $(C_6H_{10}O_5)n$
C) $(C_{12}H_{22}O_{11})n$
D) $(C_{12}H_{24}O_{11})n$

Answer 1

Hint: Starch is a white, granular, organic chemical that is produced by all green plants. It is generally soft and white in color, tasteless powder which is insoluble in cold water, alcohol or other solvents. Starch is a polysaccharide (a carbohydrate that produces more than 10 monosaccharide units on hydrolysis).

Complete answer:
The word starch get originated from its Germanic root with the meanings that strong or stiff. Starch which is also known as amylum is a polymeric carbohydrate composed of numerous glucose units and they are joined by glycosidic bonds. This polysaccharide are generally produced by most green plants as energy storage. Starch is the most common carbohydrate which are normally seen in the human diets and is present in in large amounts in staple foods like potatoes, maize ,rice, wheat and cassava. Plants make starch by first converting glucose 1-phosphate to ADP-glucose by the action of then the enzyme glucose-1-phosphate adenylyltransferase.

Pure starch is a white in colour and are tasteless and odorless powder which are insoluble in cold water or alcohol. Starch is mainly composed of two types of molecules that is amylose and the branched amylopectin.
In the industry starch is transformed into sugars .It is processed to create many of the sugars used in processed foods.
Starch is produced in the green leaves of plants from surplus glucose produced during photosynthesis and serves the plant as a reserve food supply. Starch is mainly stored in chloroplast in the form of granules. Starch is mainly used as food reserves in plants. They are generally a polymer of glucose. It is formed by the addition of glucose units by glycosidic plants.

Hence, the correct answer is option (B)

Note: Most green plants store energy in the form of starch which are packed into semi crystalline granules. The additional glucose is changed into starch which is more complex than glucose by the plants. Starch is also used in the textile industry to give stiffens to the cloth.