“Sap wood” is otherwise called:

What is correct for heartwood?

Sapwood differs from heartwood in being:

How do we compute the age of a living tree?

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

Which of the following is responsible for secondary growth?