“Sap wood” is otherwise called:

Which would do maximum harm to a tree? The loss of

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

Old trees obtain $O_2$ from

Which tissue gives rise to secondary growth?

Identify the correct statement$(s)$ regarding lenticels.