48 



PLANTS 



chief regions in which this occurs are the centre of the bud, 

 the cambium layer of the stem and roots and the root tip. The 



1/ 



'ylem from the procambium 

 Xylem from the cambium 

 Phloem from the procambium and cambium 



Xylem from the procambium 

 Xylem from the cambium 

 Phloem from the procambium and cambium 



Fig. 2 2. — Diagram to show Ihe development of the tissues (differentiation) 

 near the tip of a growing stem. The four figures on the right represent cross 

 sections at different distances from the tip of the stem. The figure should 

 represent the tip of the stem covered by the young leaves. (From Stevens.) 



growing tissue of the bud Hes at the centre of a group of older 

 structures and hence is not exposed except that the bud as a 



