Cambium

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The cambium is a cylinder of meristematic tissue that is present in woody plants, such as the tree above. There are two kinds of cambium: the vascular cambium and the cork cambium. The vascular cambium gives rise to the secondary xylem and secondary phloem. The secondary xylem grows to the cambium’s interior. It functions in the upward transport of water and minerals. The secondary xylem forms the wood of woody plants, giving them their distinctive stability. Secondary xylem also causes annual growth rings due to disproportionate growth during the year; secondary xylem does not grow during the winter and then resumes its growth when the spring comes. Secondary phloem develops exterior to the cambium and makes up part of the bark. Phloem moves sugars from storage tissues and leaves to the rest of the plant. These secondary vascular tissues increase the circumference of woody plants.  
Cork cambium produces, you guessed it, cork. Both the cork cambium and the cork are part of the bark. Cork cells protect the living tissues underneath. Eventually the cork cambium and the cork fall off due to the expansion of secondary xylem. A new cork cambium develops underneath the old and makes new cork.

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