Which of the following is a natural polymer?

Options

A. Polythene
B. Polysaccharides
C. Nylon
D. Terylene

Answer

To determine which of the given options is a natural polymer, we can analyze each option based on its origin and formation process.

### Step-by-Step Solution:

1. **Understanding Natural Polymers**:
- Natural polymers are substances that occur in nature and are derived from natural sources. They are not synthesized in laboratories.

2. **Analyzing the Options**:
- **Option A: Polythene**
- Polythene (polyethylene) is a synthetic polymer made from the polymerization of ethylene (CH2=CH2). It is produced in chemical laboratories and is not a natural polymer.
- **Option B: Polysaccharides**
- Polysaccharides are natural polymers made up of long chains of monosaccharides (simple sugars) like glucose and sucrose. They are found in nature, for example, starch and cellulose, making them a natural polymer.
- **Option C: Nylon**
- Nylon, such as Nylon 6-6, is a synthetic polymer created through the condensation polymerization of adipic acid and hexamethylene diamine. It is manufactured in laboratories and thus not a natural polymer.
- **Option D: Dacron (Terylene)**
- Dacron, also known as Terylene, is a synthetic polyester made from the chemical reaction between ethylene glycol and terephthalic acid. It is produced artificially and is not a natural polymer.

3. **Conclusion**:
- After analyzing all the options, the only natural polymer among the given choices is **Polysaccharides (Option B)**.

### Final Answer:
**Option B: Polysaccharides** is a natural polymer.