Assertion: The most commonly used bioreactors are of stirring type
Reason : The stirrer facilitates even mixing & oxygen availability throughout the bioreactor

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
B. It both Assertion & Reason are True but Reason is not a correct explanation of the Assetion
C. If Assertion is True but the Reason is False
D. If both Assertion & Reason are false

Answer

To analyze the given assertion and reason, we can break it down into a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Bioreactors:**
- A bioreactor is a vessel or container that provides a controlled environment for biochemical processes. It is used for the cultivation of microorganisms, plant cells, or animal cells to produce biological products.

**Hint:** Remember that bioreactors are essential for producing substances like antibiotics, enzymes, and other bioproducts.

2. **Types of Bioreactors:**
- There are various types of bioreactors, including batch, continuous, and stirred-tank bioreactors. Among these, stirred-tank bioreactors are the most commonly used.

**Hint:** Think about the different designs of bioreactors and which ones are most efficient for mixing and aeration.

3. **Importance of Stirring:**
- The assertion states that the most commonly used bioreactors are of the stirring type. This is true because stirring bioreactors ensure uniform mixing of the culture medium, which is crucial for the growth of microorganisms.

**Hint:** Consider why mixing is important in a bioreactor – it helps distribute nutrients and cells evenly.

4. **Role of the Stirrer:**
- The reason given is that the stirrer facilitates even mixing and oxygen availability throughout the bioreactor. This is also true, as proper mixing ensures that all cells have access to nutrients and oxygen, which are vital for their metabolic processes.

**Hint:** Think about how oxygen is essential for aerobic organisms and how stirring helps maintain its availability.

5. **Conclusion:**
- Both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion. Thus, the correct answer is that both statements are true, and the reason correctly explains the assertion.

**Hint:** When evaluating assertions and reasons, check if the reason logically supports the assertion.

### Final Answer:
Both the assertion and the reason are true, and the reason correctly explains the assertion.