The most commonly used bioreactor is of stirring type . The stirrer facilitates
(a) Temperature control
(b) pH control
(c) Oxygen availability
(d) Product removal

Options

A. Temperature control
B. pH control
C. Oxygen availability
D. Product removal

Answer

To solve the question regarding the function of the stirrer in a stirring type bioreactor, let's break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Bioreactor**:
- The question refers to a stirring type bioreactor, also known as a stirred tank bioreactor. This is a common type of bioreactor used in various biological processes.

**Hint**: Remember that stirred tank bioreactors are designed for mixing and enhancing the reaction environment.

2. **Function of the Stirrer**:
- The stirrer is a crucial component of the bioreactor. Its primary function is to mix the contents of the bioreactor evenly. This mixing is essential for ensuring that all components (nutrients, microorganisms, etc.) are uniformly distributed.

**Hint**: Think about why mixing is important in a biological process.

3. **Oxygen Availability**:
- One of the key roles of the stirrer is to facilitate oxygen transfer throughout the bioreactor. In biological processes, especially those involving aerobic organisms, oxygen is a vital component. The stirrer helps to ensure that oxygen is available to all parts of the bioreactor.

**Hint**: Consider the importance of oxygen in aerobic respiration and how it needs to be evenly distributed.

4. **Other Functions**:
- While the stirrer does help in mixing and oxygen availability, there are other systems in the bioreactor that manage temperature control, pH control, and product removal. These functions are typically handled by separate systems or mechanisms within the bioreactor.

**Hint**: Identify which functions are specifically related to mixing and oxygen transfer.

5. **Conclusion**:
- Based on the analysis, the stirrer in a stirring type bioreactor primarily facilitates oxygen availability. Therefore, the correct answer to the question is option (c) Oxygen availability.

**Hint**: Focus on the primary role of the stirrer in the context of biological processes.

### Final Answer:
(c) Oxygen availability