Merotelic attachment 

A kinetochore can attach to microtubules emanating from both poles at the same time

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Merotelic attachment 

A kinetochore can attach to microtubules emanating from both poles at the same time

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Formation of cambial ring

The cells of medullary rays, adjoining these intrafascicular cambium become meristematic and form the interfascicular cambium. Thus, a continuous ring of cambium is formed

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Activity of the cambial ring

Cambial ring becomes active and begins to cut off new cells, these cut off cells towards pith, mature into secondary xylem and the cells cut off towards periphery mature into secondary phloem

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Cork Cambium

Another meristematic tissue called cork cambium or phellogen develops, usually in the cortex region