The study of wood is called ...........

Lenticels are involved in:

$I.$ It is resistant to microorganisms
$II.$ It comprises dead elements
$III.$ It comprises highly lignified cell wall
$IV.$ It is the peripheral part
$V.$ It is dark and tough
Which of the above property does not belong to heartwood?

In which of the following is anomalous secondary growth observed?

Explain the difference between heartwood and sapwood.

Trees at sea do not have annual rings because