Complementary cells are formed by the activity of ..........

After two or three years of the secondary growth, what happens to the cortex in a dicot root?

Increase in the girth of plant (organ) takes place by

Coastal trees do not show annual rings because:

Annual rings are well-developed in trees of which of the following regions?

$A$ : 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.