Which of the following statements is/are not correct for single cell protein (SCP)?
(i) The biomass is obtained from unicellular microorganisms only.
(ii) It provides a protein rich supplement.
(iii) They can be grown easily on materials like waste water from potato processing plants, straw, manure, sewage, etc.
(iv) It helps to minimise environmental pollution.
(v) SCP has to be processed before use.

Options

A. (i), (ii) and (iv)
B. (iii) only
C. (v) only
D. (i) only

Explanation

To determine which statements about Single Cell Protein (SCP) are not correct, let's analyze each statement one by one:

**Step 1: Analyze Statement (i)**
Statement: "The biomass is obtained from unicellular microorganisms only."
- This statement is **incorrect** because SCP can be derived from both unicellular and multicellular organisms. While many SCP sources are unicellular (like algae and bacteria), there are also multicellular organisms that can contribute to SCP.

**Step 2: Analyze Statement (ii)**
Statement: "It provides a protein-rich supplement."
- This statement is **correct**. SCP is known for being rich in proteins and is often used as a dietary supplement due to its high protein content.

**Step 3: Analyze Statement (iii)**
Statement: "They can be grown easily on materials like wastewater from potato processing plants, straw, manure, sewage, etc."
- This statement is **correct**. SCP can be cultivated using various waste materials, which makes it an efficient way to utilize waste and produce protein.

**Step 4: Analyze Statement (iv)**
Statement: "It helps to minimize environmental pollution."
- This statement is **correct**. By using waste materials for SCP production, it helps reduce pollution that would otherwise occur from these waste products.

**Step 5: Analyze Statement (v)**
Statement: "SCP has to be processed before use."
- This statement is **correct**. Processing is necessary to remove unwanted components, such as nucleic acids, from SCP before it can be safely consumed.

**Conclusion:**
The only statement that is not correct is statement (i): "The biomass is obtained from unicellular microorganisms only."

### Summary of Correct and Incorrect Statements:
- **Incorrect Statement:** (i)
- **Correct Statements:** (ii), (iii), (iv), (v)