During secondary growth of plants, stem phellogen cuts of cells on both sides. The outer cells gets differentiated into ...$A$... and the inner cells gets differentiated into ...$B$... cortex
Choose the correct combination of $A$ and $B$ with reference to above statement
Vascular cambium of dicot root is purely secondary in origin and arise from
Give explanation about cork cambium.
What do hardwood and softwood stand for?