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Where does the vascular cambium lie, and what does it produce inwards?
AInside the primary xylem, producing secondary phloem inwards
BInside the primary phloem, producing phelloderm inwards
COutside the primary xylem, producing secondary xylem inwards
DOutside the primary phloem, producing cork cells inwards
Answer & Solution
Correct answer: C. Outside the primary xylem, producing secondary xylem inwards
1. Lateral meristems include the vascular cambium and, in woody plants, the cork cambium.
2. The vascular cambium lies just outside the primary xylem and to the interior of the primary phloem.
3. Its cells divide to form secondary xylem, meaning tracheids and vessel elements, on the inside.
4. The same cambium forms secondary phloem, meaning sieve elements and companion cells, on the outside.
5. Options that push secondary phloem inwards reverse the two products, which is the commonest slip here.
6. Cork cells and phelloderm come from the cork cambium instead, so those options name the wrong meristem entirely.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.2 Stems_
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