The vascular cambium _____.

is part of a plant's primary growth

produces secondary phloem and xylem tissue

decreases in ring size each year

Verified Answer :

The vascular cambium produces secondary phloem and xylem tissue.
Vascular cambium, a plant tissue located between the xylem and the phloem in
the stem of a vascular plant. It is also the source of both secondary xylem growth
and the secondary phloem growth.  Vascular
cambium is usually found on dicots and gymnosperms not on monocots which
usually lack secondary growth. It does not transport water, dissolved food or
minerals by plants.

Vascular cambia are cylinders of unspecialized meristem cells which
divide  to make new cells which
specialize to form secondary vascular tissues.