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In a ringing experiment a strip of bark is removed from a stem. Above the ring the bark soon swells because
AXylem transport stops and water gathers above
BPhloem transport is broken and sugars pile up above
CCambium cells stop dividing in the stripped region
DStomata above the ring close because of injury
Answer & Solution
Correct answer: B. Phloem transport is broken and sugars pile up above
1. Phloem lies in the bark; xylem lies in the wood inside.
2. Removing the bark breaks the downward food path.
3. Sugars made in leaves cannot pass the ring and accumulate above it.
4. The build-up causes the bark to swell.
_Source: Selina Concise Biology Class 8, Ch on Transport in Plants (Mistral OCR'd PDF), Ringing Experiment_
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