Which tissue gives rise to secondary growth?

The amount of secondary xylem produced is $8-10$ times more than that of secondary phloem every year. Choose the correct option.

Coastal trees do not show annual rings because:

Which of the following will cause the maximum damage to a tree?

$A$ : The oldest layer of sapwood lies just outside the vascular cambium.
$R$ : Sapwood contains actively conducting vessels and occupies the central part of the stem.

In which region do plants show distinct annual rings during their growth?