ANATOMY STUDY OF ROOTS 



53 



EXPT. 38. Compare the roots of the Deadnettle, or any other plant 

 which can be obtained, with the Wallflower, and note the number 

 of rows of secondary roots. 



Adventitious Boots. The roots which are produced 

 without any definite order from stems, leaves and roots are 

 termed adventitious. In most monocotyledonous plants the 

 primary root is either very short or ceases to grow soon after it 

 leaves the seed. Its place is taken by an immense number of 

 adventitious roots which spring from the stem. When gardeners 

 place cuttings in the soil, they are said to " strike " when they 



FIG. 71. The fibrous roots of a Grass. 



FIG. 72. Branches of a Gooseberry 

 bush producing adventitious roots. 



take root. This is brought about by adventitious roots being 

 produced from the nodes of the stem which is pushed into the 

 soil. 



Clinging Roots. When adventitious roots are used for 

 climbing as in the Ivy, they are called climbing or clinging 

 roots. Roots of this kind are very highly developed in many 

 tropical plants like the Orchids. 



