Distinct annual rings are formed in plants growing in:

Which of the following tissues originates from the vascular ray initials?

Select the correct statement$(s)$:
$(1)$ Lenticels are absent in woody climbers.
$(2)$ Lenticels are found in most woody trees.
$(3)$ Spring wood is lighter in color and has a lower density.
$(4)$ Sapwood is also known as duramen (heartwood).

Old trees obtain $O_2$ from

In dicot roots,the vascular cambium originates from:

Dendrochronology is