Cork tissue arises from

Describe vascular cambium responsible for secondary growth in detail.

During secondary growth of plants, stem phellogen cuts of cells on both sides. The outer cells gets differentiated into …$A$… and the inner cells gets differentiated into …$B$… cortex

Choose the correct combination of $A$ and $B$ with reference to above statement

Identify 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

$II.$ Autumn wood

$III.$ Secondary phloem

$IV.$ Phellem

Vascular cambium of stem is