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Which of the following meristems is responsible for extrastelar secondary growth in dicotyledonous stem?

1. Intrafascicular cambium
2. Interfascicular cambium
3. Intercalary meristem
4. Phellogen

Correct answer: Phellogen

Solution

Phellogen, or cork cambium, produces the periderm during secondary growth and is responsible for extrastelar growth. Intrafascicular and interfascicular cambium mainly contribute to vascular cambium, while intercalary meristem is for elongation.

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