$A$ timber merchant told a customer that the log of wood he is purchasing belongs to a $20$-year-old tree. He did so by

The $phellogen$ (cork cambium) develops from $...................$.

In heartwood,the conduction of sap is mostly blocked due to the presence of:

Identify the incorrect statement.

Which of the following is the function of heartwood?

Read the different components from $(i)$ to $(iv)$ in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.
$(i)$ Secondary cortex $(ii)$ Wood $(iii)$ Secondary phloem $(iv)$ Phellem
The correct order is: