Select the incorrect statement for continuous culture system

Options

A. In this used medium is drained out from one side while fresh medium is added from other side
B. In this cells are maintained in their physiologically most active lag phase of growth
C. It produces larger biomass
D. It shows higher yields of desired products

Answer

To solve the question regarding the incorrect statement for continuous culture systems, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Continuous Culture Systems**: Continuous culture systems are bioreactors where fresh medium is continuously added, and used medium is drained out. This allows for a constant supply of nutrients and removal of waste products.

2. **Identify Key Features**: In continuous culture systems, the physiological conditions such as temperature and pH are maintained to keep the microorganisms in their most productive phase, which is typically the log (or exponential) phase of growth.

3. **Evaluate the Statements**:
- **Statement 1**: "In this system, the used medium is drained out from one side while fresh medium is added from the other side."
- This is a correct statement as it accurately describes the operation of a continuous culture system.

- **Statement 2**: "In this medium, cells are maintained in their physiologically most active lag phase of growth."
- This statement is incorrect because the most active phase is the log phase, not the lag phase. The lag phase is a period of adjustment where cells are not actively dividing.

- **Statement 3**: "It produces larger biomass and shows high yield of the desired products."
- This is a correct statement as continuous culture systems are designed to maximize biomass and product yield.

4. **Conclusion**: Based on the evaluation of the statements, the incorrect statement is Statement 2.

### Final Answer:
The incorrect statement for continuous culture systems is: "In this medium, cells are maintained in their physiologically most active lag phase of growth."

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