Bark refers to all tissues exterior to the
Cork cambium
Pericycle
Vascular cambium
Periderm
Bark is non technical term given to all tissues down the bast $i.e.$, upto secondary phloem.
Lenticel develops through the activity of
The activity of cambium in plants is under the control of
Growth rings are formed due to activity of
In the given diagram of lenticel, label $A, B, C$ in the given option
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