Growth rings $(annual\ rings)$ are formed by activity of
Cambium
Xylem
Phloem
Both xylem and phloem
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
Desert grasses often roll their leaves due to presence of
Which of the following are derived from the secondary meristems
interfascicular cambium develops from the cells of :
Give differences: Heartwood and Sapwood