Age of a tree can be estimated by :
biomass
number of annual rings
diameter of its heartwood
its height and girth
In dicot stem, secondary xylem lie towards the ...$A$... and secondary phloem lie towards the ...$B$...
Choose the correct combination of options for $A$ and $B$
Vascular bundles of roots are
The common bottle cork is a product of
Casparian strips occur in