Which of the following is responsible for the formation of secondary medullary rays?

Growth of secondary xylem

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Growth of Cambium through secondary xylem and seoondary phloem

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Growth of secondary phloem into secondary xylem

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None of the above

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Solution

The correct option is B Growth of Cambium through secondary xylem and seoondary phloem
During the secondary growth, the secondary xylem grows outwards and crushes the secondary phloem. However, the cambium forms a band of parenchyma cells that grows through the secondary xylem and secondary phloem and forms the secondary medullary rays.

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