An increrase in plant girth due to activity of _____________ is called secondary growth?
Correct answer: D. Both a and c
- A. Cork cambium
- B. Pith.
- C. Vascular cambium.
- D. Both a and c
Explanation
Secondary growth increases stem or root girth through the vascular cambium, which forms secondary xylem and phloem, and the cork cambium, which forms protective periderm. Since both cambiums contribute, option d is correct; choosing only option c ignores the contribution of cork cambium.
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