Dendrochronology is

Wood is

Select the wrong statements.
$I.$ Primary and secondary phloem gets crushed during secondary growth.
$II.$ During secondary growth,primary xylem remains more or less intact.

Besides phellem and phellogen,the root periderm comprises of:

Choose the correct options for the following statements:
$(i)$ Interfascicular cambium is a primary / secondary meristematic tissue.
$(ii)$ Secondary growth does not occur in monocot / dicot stems.

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).