Complementary cells are associated with

Vascular tissues containing a large number of vessels and fibers are .........

In the primary tissues of the stem,the cambium separating xylem and phloem is called

Dendrochronology is the study of

Select the incorrect statement.

$A$ : The oldest layer of sapwood lies just outside the vascular cambium.
$R$ : Sapwood contains actively conducting vessels and occupies the central part of the stem.