Question

what is responsible for increase the girth of stem or root​

Answer 1

Answer:

Girth of the stem increases due to lateral meristematic tissues. They are found beneath the bark (called cork cambium) and in vascular bundles of dicot roots andstems (called vascular cambium) as thin layers. This increase in the diameter and girth of the plant is called secondary growth.

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Answer 2

Explanation:

Cambium is responsible for the increase in the girth of stem and root