Which of the following is source of single cell protein

Options

A. Bacillus thuringiensis
B. Azospirillum
C. Sachharomyces cerevisiae
D. Methylophilus methylotrophus

Answer

To determine which of the following options is a source of single cell protein (SCP), we need to analyze each option provided:

1. **Bacillus thuringiensis**: This bacterium is primarily known as a biopesticide. It is used to control pests in agriculture and is not utilized as a source of single cell protein. Therefore, this option is incorrect.

2. **Azospirillum**: This is a genus of bacteria that acts as a bio-fertilizer. It is known for its ability to fix nitrogen and provide nutrients to plants, but it is not a source of single cell protein. Thus, this option is also incorrect.

3. **Saccharomyces cerevisiae**: This is a type of yeast commonly known as baker's yeast. It is widely used in baking and fermentation processes, but while it is a source of protein, it is not typically classified under single cell protein in the context of dietary supplements. Therefore, this option is incorrect.

4. **Methylophilus Methylotrophus**: This is a type of methylotrophic bacteria that can utilize methanol as a carbon source. It is recognized as a source of single cell protein and is used in animal feed due to its high nutrient content. This option is correct.

Based on the analysis, the correct answer is **Methylophilus Methylotrophus**.

### Summary of Steps:
1. Identify the definition of single cell protein (SCP).
2. Analyze each option to determine its primary use.
3. Eliminate options that do not serve as SCP.
4. Confirm the correct option that is recognized as a source of SCP.