$A$ : Bark is all the tissue outside steler cambium.

$R$ : Bark is formed due to the activity of phellogen only.

The bark of tree comprises

Identify the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.

$I.$ Secondary cortex

$II.$ Autumn wood

$III.$ Secondary phloem

$IV.$ Phellem

Mark the correct sequence of layers found in root anatomy.

What do hardwood and softwood stand for?