Which given statements are incorrect for bioreactors?

Options

A. Larger biomass is produced in a batch culture system as according to continuous culture in a bioreactor
B. The most commonly used bioreactors are stirred type
C. Stirrer facilitates even mixing of oxygen and nutrients
D. Bioreactor is a type of fermenter in which raw materials are biologically converted into specific products

Answer

To determine which statements about bioreactors are incorrect, we need to analyze the provided statements based on our understanding of bioreactor systems.

### Step-by-Step Solution:

1. **Understanding Bioreactors**:
- Bioreactors are large vessels (typically 100 to 1000 liters) where biological processes occur. They are used to convert raw materials into specific products, such as vaccines, enzymes, drugs, or proteins.

2. **Types of Bioreactor Systems**:
- There are two main types of bioreactor systems: batch culture and continuous culture.
- **Batch Culture System**: In this system, raw materials are added to the bioreactor, and after the fermentation process, the entire batch is harvested. The bioreactor is then emptied, sterilized, and prepared for the next batch.
- **Continuous Culture System**: In this system, raw materials are continuously fed into the bioreactor, and products are continuously removed. This allows for a constant production process without the need to empty the bioreactor.

3. **Evaluating the Statements**:
- The first statement claims that "large biomass is produced in batch culture system as compared to continuous culture system."
- This statement is incorrect because, in a continuous culture system, larger biomass can be produced over time since the process is ongoing and does not require the bioreactor to be emptied and sterilized between batches.

4. **Conclusion**:
- Based on the analysis, the incorrect statement regarding bioreactors is that large biomass is produced in a batch culture system compared to a continuous culture system.

### Final Answer:
The incorrect statement is: "Large biomass is produced in batch culture system as compared to continuous culture system."

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