Answer:
(b) 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 and stems (called vascular cambium) as thin
layers. This increase in the diameter and girth of the plant is called
secondary growth.
The apical meristem is situated at the growing tip of
stems, root and also at the apices of leaf. They bring about elongation, i.e.,
increase in height (primary growth) of the plant. Intercalary meristem are
located at base of leaf and internode and produces an increase in the length of
an organ.
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