Assertion Xylem condition in roots is exarch
Reason Xylem has four different types of cells.

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 xylem conditions in roots, we can follow these steps:

### Step 1: Understand the Assertion
The assertion states that "Xylem condition in roots is exarch."
- **Explanation**: Exarch xylem means that the protoxylem (the first formed xylem) is located towards the outside of the xylem structure, while the metaxylem (the later formed xylem) is located towards the center. This condition is indeed found in the roots of many plants.

### Step 2: Understand the Reason
The reason provided is that "Xylem has four different types of cells."
- **Explanation**: The four types of cells in xylem are:
1. Xylem tracheids
2. Xylem fibers
3. Xylem parenchyma
4. Xylem vessels
This statement is also true, as these are the primary components of xylem tissue.

### Step 3: Analyze the Relationship Between Assertion and Reason
Now, we need to determine if the reason is a correct explanation of the assertion.
- **Analysis**: While both the assertion and reason are true, the reason does not explain why the xylem condition in roots is exarch. The presence of four types of xylem cells does not directly relate to the arrangement of protoxylem and metaxylem in roots.

### Step 4: Conclusion
Based on the analysis:
- The assertion is true.
- The reason is true.
- However, the reason is not a correct explanation of the assertion.

### Final Answer
Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.

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