This wood is dark in color,has high density,and contains fewer,narrower vessels.

$A$ : 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.

Bark $= .....................$

Which of the following is true regarding diffuse-porous and ring-porous wood?

The balloon-like outgrowths of parenchyma cells in the lumen of vessels are known as .......

What is the inner bark primarily composed of?