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Which of the following is completely secondary in origin?
Option: 1
Phellogen
Option: 2
Root cambium
Option: 3
Both a and b
Option: 4
None of these
Answers (1)
Secondary Growth in Dicot Roots
- In the dicot root, the vascular cambium is completely secondary in origin.
- It originates from the tissue located just below the phloem bundles, a portion of pericycle tissue, above the protoxylem forming a complete and continuous wavy ring, which later becomes circular.
- Further events are similar to those already described above for a dicotyledon stem.
Both the phellogen and root vascular cambium are secondary in origin.
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