Cellulose-rich food substances (i.e. roughages) are considered an essential component of a balanced diet of human beings. Which one of the following is the correct statement about cellulose?

Options

A. Human beings do not have cellulose-digesting enzymes
B. Cellulose is a type of carbohydrate, which gets absorbed in the human blood and gives energy
C. Cellulose breaks down easily into smaller components which are egested as roughages
D. The cellulose-digesting bacteria present in human beings convert cellulose into fibres

Explanation

### Step-by-Step Solution:

1. **Understanding Cellulose**: Cellulose is a complex carbohydrate that is a major component of plant cell walls. It is classified as a polysaccharide and is not digestible by humans.

2. **Role of Cellulose in Diet**: Foods rich in cellulose, often referred to as roughages, are essential for human health. They aid in digestion by promoting bowel movements and preventing constipation.

3. **Human Digestive System**: Humans lack the necessary enzymes to break down cellulose. This means that while cellulose is consumed, it is not digested and instead passes through the digestive system.

4. **Correct Statement Identification**: The question asks for the correct statement about cellulose. The statement "human beings do not have a cellulose digesting system" is accurate because humans do not produce the enzymes needed to digest cellulose.

5. **Eliminating Incorrect Statements**: Other statements may incorrectly classify cellulose or misrepresent its role in human digestion. For instance, stating that "cellulose is a type of carbohydrate" is misleading in this context, as it does not highlight the inability of humans to digest it.

6. **Conclusion**: The correct statement regarding cellulose is that "human beings do not have a cellulose digesting system." This highlights the importance of roughages in the diet, despite their indigestibility.