The tissue made up of thin-walled rectangular cells responsible for the secondary growth 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

Vascular cambium is a meristematic layer that cuts off

Explain the process of secondary growth in stems of woody angiosperm with help of schematic diagrams. What is the significance?

When secondary growth is initiated in dicot stem, what will happen first?

Growth rings $(annual\ rings)$ are formed by activity of