Which of the following statement is CORRECT?

Options

A. Spirullina is a biopesticide.
B. Propionibacterium shermanii is involved in the formation of Swiss cheese
C. Germinating barley seeds are used in the preparation of Toddy.
D. Secondary treatment of sewage involves the vigorous growth of anaerobic microbes into fiocs.

Answer

To determine which of the statements is correct, we will analyze each statement one by one.

1. **Statement 1: Spirulina is a bio-pesticide.**
- Spirulina is a type of blue-green algae that is known for being a source of protein, specifically single-cell protein (SCP). It is not classified as a bio-pesticide. Therefore, this statement is incorrect.

2. **Statement 2: Propionibacterium sharmani is involved in the formation of Swiss cheese.**
- Propionibacterium sharmani is indeed involved in the fermentation process of Swiss cheese. It produces carbon dioxide, which creates the characteristic holes in Swiss cheese. This statement is correct.

3. **Statement 3: We use germinating barley seeds in the preparation of Toddy.**
- While barley seeds are soaked and germinated to produce malt, which is used in beer production, Toddy is typically made from the sap of palm trees. Therefore, this statement is incorrect.

4. **Statement 4: In the secondary treatment of sewage, we get vigorous growth of anaerobic microbes in flocks.**
- In the secondary treatment of sewage, aerobic microbes are used to break down organic matter. The statement incorrectly states that anaerobic microbes are involved. Therefore, this statement is also incorrect.

Based on the analysis above, the correct statement is:

**Correct Answer: Statement 2 - Propionibacterium sharmani is involved in the formation of Swiss cheese.**