Assertion . Movement of materials inside phloem is bidirectional, both upwards and downwards
Reason. Movement of molecules inside xylem is unidirectional always upwards

Options

A. If both are true with reason being correct explanation (A).
B. If both are true with but reason is not the correct explanation (B).
C. assertion is true but reason is wrong (C)
D. And both are wrong (D)

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that the movement of materials inside the phloem is bidirectional, meaning it can move both upwards and downwards. This is true because phloem is responsible for transporting nutrients (mainly sugars) produced in the leaves to other parts of the plant, which can include both upward movement to the growing tips and downward movement to the roots.

2. **Understanding the Reason:**
- The reason given states that the movement of molecules inside the xylem is unidirectional and always upwards. This is also true because xylem primarily transports water and minerals from the roots to the leaves, and this movement is typically in one direction (upwards).

3. **Evaluating the Relationship:**
- Both the assertion and reason are true statements. However, the reason does not explain the assertion. The fact that xylem movement is unidirectional does not provide a rationale for why phloem movement is bidirectional. They are two separate processes that occur in different plant tissues.

4. **Conclusion:**
- Since both the assertion and reason are true, but the reason does not correctly explain the assertion, the correct answer is that both statements are true, but the reason is not the correct explanation of the assertion.

**Final Answer:**
- The correct option is: Both assertion and reason are true, but the reason is not the correct explanation of the assertion.

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