Which of the following materials takes the longest time for biodegradation ?

Options

A. Cotton
B. Paper
C. Bone
D. Jute

Explanation

To determine which material takes the longest time for biodegradation among the options provided (A. Cotton, B. Paper, C. Bone, D. Jute), we can analyze each material based on its composition and the factors that affect its degradation.

### Step-by-Step Solution:

1. **Understand Biodegradation**: Biodegradation is the process by which organic substances are broken down by living organisms, typically microorganisms, into simpler, non-toxic substances. The rate of biodegradation depends on the material's composition and environmental conditions.

2. **Analyze Cotton**: Cotton is a natural fiber made from the cotton plant. It is highly biodegradable and can decompose relatively quickly when exposed to moisture and microorganisms.

3. **Analyze Paper**: Paper is made from wood pulp and is also biodegradable. It breaks down fairly quickly in the presence of moisture and microorganisms, similar to cotton.

4. **Analyze Jute**: Jute is another natural fiber, derived from the jute plant. Like cotton and paper, jute is biodegradable, although it may take a bit longer than cotton and paper due to its thicker fibers.

5. **Analyze Bone**: Bone is a complex structure made up of collagen (a protein) and inorganic minerals, primarily calcium. The unique structure of collagen makes it resistant to breakdown. Additionally, the presence of inorganic salts strengthens the bone, making it much more difficult for microorganisms to decompose.

6. **Conclusion**: Among the materials listed, bone takes the longest time to biodegrade due to its complex structure and the presence of inorganic minerals. Therefore, the correct answer is **C. Bone**.

### Final Answer:
The material that takes the longest time for biodegradation is **C. Bone**.

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