Yeasts form a pseudomycelium.
Yeast are prokaryotic.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

To solve the question regarding the assertion and reason about yeast, we will break it down step by step.

### Step-by-Step Solution:

1. **Identify the Assertion and Reason:**
- Assertion: "Yeasts form a pseudomycelium."
- Reason: "Yeasts are prokaryotic."

2. **Evaluate the Assertion:**
- Yeasts are unicellular organisms that belong to the kingdom Fungi.
- They can form structures known as pseudomycelium, which is a chain-like arrangement of yeast cells that resemble true mycelium but are not the same.
- Therefore, the assertion that "Yeasts form a pseudomycelium" is **true**.

3. **Evaluate the Reason:**
- The reason states that "Yeasts are prokaryotic."
- However, yeasts are actually unicellular eukaryotes, which means they have a true nucleus and membrane-bound organelles.
- Thus, the statement that "Yeasts are prokaryotic" is **false**.

4. **Conclusion:**
- Since the assertion is true and the reason is false, we can conclude that the correct answer is that the assertion is correct, but the reason is incorrect.

### Final Answer:
- The assertion is true, and the reason is false.