In autumn season, the callus pads appear on

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 $B$

Duramen is present in

As compared to a dicot root, a monocot root has

'Protoderm' and 'procambium' terms were coined by

Which layer in dicot stem is rich in starch grains?