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If you could connect and active xylem ve...

If you could connect and active xylem vessel from a shoot to an active phloem sieve-tube member from a leaf using a "micropipe," which way would the solution flow between the two?

A

The solution would flow from xylem to phloem.

B

The solution would flow from phloem to xylem

C

The solution would flow back and forth from one to another.

D

The solution would not flow between the two.

Text Solution

AI Generated Solution

The correct Answer is:
To determine the direction of solution flow between an active xylem vessel from a shoot and an active phloem sieve-tube member from a leaf when connected by a micropipe, we need to understand the functions of xylem and phloem in plants. ### Step-by-Step Solution: 1. **Understanding Xylem Function**: - Xylem is responsible for transporting water and dissolved minerals from the roots to the rest of the plant, particularly to the leaves where photosynthesis occurs. 2. **Understanding Phloem Function**: - Phloem, on the other hand, transports organic nutrients, especially sugars produced during photosynthesis, from the leaves to other parts of the plant, including roots and growing tissues. 3. **Identifying the Source and Sink**: - In this scenario, the active xylem vessel is likely carrying water and minerals upwards from the roots to the leaves. The active phloem sieve-tube member from the leaf is transporting sugars downwards to other parts of the plant. 4. **Direction of Flow**: - If we connect the xylem and phloem with a micropipe, the flow will be dictated by the pressure gradients and the nature of the substances being transported. - Water and minerals in the xylem will flow upwards towards the leaves, while the sugars in the phloem will flow downwards towards the roots. 5. **Conclusion**: - Therefore, if you connect an active xylem vessel from a shoot to an active phloem sieve-tube member from a leaf, the solution (water and minerals) will flow from the xylem to the phloem, primarily due to the upward movement of water in the xylem and the downward movement of sugars in the phloem. ### Final Answer: The solution would flow from the xylem vessel to the phloem sieve-tube member.
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