a ring of a bark is removed from the stem before it is bent down, in the layering method of artificial proportion. explain by giving reasons

In plants, under the bark are the tissues like phloem, xylem and cambium. In the plants that are propagated by layering, a ring of bark is removed to remove phloem and cambium from that portion while xylem is kept intact. This is done to prevent the flow of food from leaves of that bent branch to the trunk of tree, instead food stops after reaching at the cut site and helps the cell there to grow faster. The xylem is kept intact so that the bent branch can absorb water and minerals form the soil to prevent drying of leaves.