Iodine is obtained from algae

Options

A. Chlorella
B. Polysiphonia
C. Spirogyra
D. Laminaria

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question states that iodine is obtained from algae. We need to determine which type of algae is the source of iodine from the given options: Chlorella, Polysiphonia, Spirogyra, and Laminaria.

2. **Understand the Types of Algae**:
- **Chlorella**: A green microalga, primarily known for its nutritional benefits but not a significant source of iodine.
- **Polysiphonia**: A red alga that is not known for iodine content.
- **Spirogyra**: A green filamentous alga, also not a source of iodine.
- **Laminaria**: A type of brown seaweed, commonly known as kelp, which is known to contain iodine.

3. **Research the Iodine Content**:
- **Laminaria** is specifically noted for its high iodine content. Iodine is essential for the production of thyroid hormones in the human body, which regulate metabolism.

4. **Consider Other Nutritional Benefits**:
- In addition to iodine, Laminaria is also a rich source of iron and potassium. It has medicinal uses, including potential benefits for weight loss, high blood pressure, and cancer prevention.

5. **Conclusion**: Based on the information gathered, the correct answer to the question of which algae is a source of iodine is **Laminaria**.

**Final Answer**: Laminaria (Option 4)

---