If one debarks a tree,what parts of the plant are being removed?

What is/are true about heartwood?
$I.$ It does not help in water conduction.
$II.$ It is also called alburnum.
$III.$ It is dark in colour but very soft.
$IV.$ It has tracheary elements,which are filled with tannin,resin,etc.

Which of the following is the function of heartwood?

Trees at sea do not have annual rings because

“Sap wood” is otherwise called:

Which of the following is not formed from the procambium?