Explain what will happen to a …

• The growth that results from cell division in the cambia or lateral meristems which causes the stems and roots to thicken is called secondary growth
• This type of growth occurs due to the activity of the two lateral meristems- the cork cambium and vascular cambium. 
• Secondary growth in dicots:- 

1) Formation of cambium ring:

• The cambium of vascualr bundles becomes meristematic.
• Some of the medullary ray cells lying at the level of cambium also become meristematic.
•  It forms a strip of interfasciular cambium together with intrafasciular cambium to form a circular ring called cambium ring.
• This cambium ring forms secondary tissues in the stellar region.
• The vascular cambium consists of two types of cells-  fusiform initials and ray initials. 
• The fusiform initials are vertically oriented which divide to form the elements of xylem and phloem.

2) Formation of secondary vascular tissues: 

• The cambium ring cuts off new cells, both on outer and inner sides,
• The new cells formed on the outer side modify into the elements of secondary phloem.
• The cells formed on the inner side modify into the secondary xylem.

3) Vascular rays: 

• Ray initials of the cambium ring form narrow bands of parenchymatous cells.
• These cells extend radially from the pith to the phloem. 
• These are called secondary medullary rays or vascular rays.