During secondary growth, a tree adds more xylem and phloem through the activity of the a. apical

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During secondary growth, a tree adds more xylem and phloem...

Key Concepts

Secondary Growth

Secondary growth refers to the increase in girth or thickness in plants, primarily due to the activity of lateral meristems. This process, common in woody plants, involves the production of additional vascular and protective tissues, allowing the plant to expand in diameter over time.

Vascular Cambium

The vascular cambium is a type of lateral meristem crucial for secondary growth. It is responsible for producing secondary xylem (wood) and secondary phloem (inner bark), thereby increasing the plant’s diameter and contributing to the formation of the tree's structural support and transport systems.

Xylem

Xylem is a vascular tissue that transports water and dissolved minerals from the roots to the rest of the plant. During secondary growth, the vascular cambium generates new xylem cells, contributing to the development of wood and the overall structural integrity of the tree.

Phloem

Phloem is the vascular tissue that distributes organic nutrients, particularly photosynthates like sugars, throughout the plant. In the context of secondary growth, the production of new phloem by the vascular cambium helps maintain the plant’s nutrient distribution as the stem increases in size.

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