The functional xylem of dicot tree is
Sap wood
Hard wood
Heart wood
Autumn wood
Explain the process of secondary growth in stems of woody angiosperm with help of schematic diagrams. What is the significance?
Lenticel develops through the activity of
Given below are two statements : One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$ : Late wood has fewer xylary elements with narrow vessels.
Reason $R$ : Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below :
$A$ : In monocot roots, pericycle gives rise to lateral roots and cork cambium.
$R$ : It has tetrach vascular bundles usually.
One year's growth in length of a young woody shoot is the distance between successive