BI-2111
Translocation
Biology · Secondary 4 · Hard · Translocation
In an experiment on translocation, a ring of phloem tissue is removed from the stem of a young plant just above the roots. After several hours, leaves continue to make sucrose, but the roots receive almost none.
Which statement best explains this observation?
Which statement best explains this observation?
- The downward flow of sucrose in the phloem is cut, so sucrose cannot be transported to the roots.
- The xylem is removed, so water cannot move up to the leaves to make sucrose.
- The phloem above the ring now transports sucrose upwards instead of downwards.
- Sucrose is no longer made in the leaves because the stem has been cut.
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