When the vascular cambium is present between the xylem and phloem,then the vascular bundle is called,

Sapwood differs from heartwood in being:

Read the different components from $(i)$ to $(iv)$ in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.
$(i)$ Secondary cortex $(ii)$ Wood $(iii)$ Secondary phloem $(iv)$ Phellem
The correct order is:

Cork is a derivative of

The function of the $phellogen$ (cork cambium) is to produce $........$.

The cork cambium,cork,and secondary cortex are collectively called: