262 Education through Nature 



ROOTS or PLANTS. 



' i. Primary 



I. Kinds of Roots as to Origin 



Roots as Regards Distribution 



2. Secondary 



3. Tertiary 



.4. Adventitious 



1. Soil-roots 



2. Water-roots 



3. Aerial roots 



4. Parasitic roots 



f i. Fibrous 

 3. Forms of Roots '.Fascicled 



1 3. Fleshy \ 2. 

 1 3- 



Napeform 1 



Conical + Tap-roots 



Fusiform J 



4. Roots as Regards Duratio: 



f i. Ar 

 ion \ 2. Bi 

 I 3. Pe 



Annual 



Biennial 



Perennial 



6. Adaptations of 

 Roots to 



2. Storage 



Underground position prevents 



freezing 

 Thickened epidermis prevents loss 



of water 



3. Support Hard tap-root and tough secondary 



roots 



f i. Ramification of rootlets 



4. Holdfasts ) 2. Large descending tap-root 



(. 3. Twisting of aerial roots 



