Biology · Plant Physiology
A radioactive tracer introduced into a leaf appears rapidly in roots but not in adjacent mature leaves. This suggests:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Apoplastic flow throughout the leaf mesophyll
- 2Uniform diffusion across tissues
- 3Selective phloem transport along specific source-to-sink pathways✓
- 4Xylem transport dominance
Correct answer
Selective phloem transport along specific source-to-sink pathways
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