Explain the process of secondary growth in stems of woody angiosperm with help of schematic diagrams. What is the significance?
Cork cells are
Commercially important fibres of cotton are
Each of the following terms has some anatomical significance. What do these terms mean ? Explain with the help of line diagrams.
$(A)$ Plasmadesmoses / Plasmodesmata
$(B)$ Middle lamella
$(C)$ Secondary wall