Question

Cellulose present in plants and as a food for cattle but not for human beings because?
A) Human body does not contain cellulose hence cellulose cannot be broken into D-glucose
B) Human saliva cannot break down plant cellulose in small pieces.
C) Bile juice present in cattle helps them to digest cellulose.
D) Human beings have a smaller stomach than cattle

Answer 1

Hint: We have to remember that the carbohydrates are also known as saccharides. The word meaning of saccharides is sugar. In the human body carbohydrates are stored as glycogen. In plants carbohydrates are stored as starch. It is the main source of energy for human beings. Carbon and water are the basic units of carbohydrates. The word meaning of carbohydrate is carbon + hydrate. Hydrate means nothing but water.

Complete answer:
The cattle have enzyme cellulose that is used to break down plants into D-glucose. But that enzyme is absent in the human body, that is the reason we are not able to eat, because we are not able to break plants into D-glucose.
According to the above discussion, Cellulose present in plants and as a food for cattle but not for human beings because Human body does not contain cellulose hence cellulose cannot be broken into D-glucose.
Hence, option A is correct. The reason for this is Cellulose present in plants and as a food for cattle but not for human beings because Human body does not contain cellulose hence cellulose cannot be broken into D-glucose.

Note:
We have to remember that carbohydrates are classified as three major groups. This classification is based on the hydrolysis of carbohydrates. There are monosaccharides, oligosaccharides and polysaccharides. Monosaccharides here means only one carboxylic group in the molecule. Respect that carboxylic group hydrolysis will happen. Glucose, fructose are examples of monosaccharides. Lactose and maltose are examples of oligosaccharides, because they contain more than one functional monomer in the structure. Starch, glycogen and cellulose are the examples of polysaccharides because they have more than three monomers in the structure.