Which of the following is /are cellulose
(i) Paper`" "`(ii) Cotton fibre
(iii) Chitin`" "` (iv) Glycogen

Options

A. I and ii
B. I and iii
C. I, iii and iv
D. iii and iv

Answer

To determine which of the given options are cellulose, we need to analyze each option based on the definition and characteristics of cellulose.

### Step-by-Step Solution:

1. **Understanding Cellulose**:
- Cellulose is a polysaccharide that is the main component of the cell wall in plants. It is the most abundant organic polymer on Earth.

2. **Analyzing Each Option**:
- **(i) Paper**:
- Paper is made from wood pulp, which is primarily composed of cellulose. Therefore, paper is cellulose.
- **(ii) Cotton Fibre**:
- Cotton fibers are also made up of cellulose. Cotton is a natural fiber that comes from the cotton plant, which contains a high percentage of cellulose. Thus, cotton fiber is cellulose.
- **(iii) Chitin**:
- Chitin is not cellulose. It is a polysaccharide made of N-acetylglucosamine units and is found in the cell walls of fungi and the exoskeletons of arthropods. Therefore, chitin is not cellulose.
- **(iv) Glycogen**:
- Glycogen is a polysaccharide that serves as a form of energy storage in animals. It is made up of glucose units but is not cellulose. Therefore, glycogen is not cellulose.

3. **Conclusion**:
- Based on the analysis, the only options that are cellulose are (i) Paper and (ii) Cotton Fibre. Thus, the correct answer is options (i) and (ii).

### Final Answer:
The cellulose options are:
(i) Paper and (ii) Cotton Fibre.