Spirulina is:

Options

A. Biofertilizer
B. Biopesticide
C. Edible fungus
D. Single cell protein

Answer

**Step-by-Step Solution:**

1. **Understanding the Options:**
- The question presents four options regarding what Spirulina is: Biofertilizer, Biopesticide, Edible Fungus, and Single-Cell Protein.

2. **Analyzing Biofertilizers:**
- Biofertilizers are microorganisms that enhance the nutrient content of the soil. They help in increasing the supply of essential nutrients to plants. An example of a biofertilizer is Rhizobium, a nitrogen-fixing bacterium.
- Conclusion: Spirulina does not fit this category.

3. **Analyzing Biopesticides:**
- Biopesticides are living microorganisms that target pests and pathogens affecting plants. They help in controlling pest populations.
- Conclusion: Spirulina is not a biopesticide.

4. **Analyzing Edible Fungus:**
- Edible fungi refer to fungi that can be consumed, such as mushrooms.
- Conclusion: Spirulina is not classified as an edible fungus.

5. **Analyzing Single-Cell Protein (SCP):**
- Single-Cell Protein refers to protein derived from single-celled organisms, including bacteria, algae, and fungi. Spirulina is a type of blue-green algae and is recognized as a rich source of protein, making it suitable for human and animal nutrition.
- Conclusion: Spirulina is indeed classified as Single-Cell Protein.

6. **Final Answer:**
- Based on the analysis, the correct classification of Spirulina is **Single-Cell Protein**.