Why do particles of soil adhere to a young plant of wheat or 

 cabl)age when it is pulled up? 



What do vou understand bv a solution ? 



Give an example of a substance which will dissolve in water, 

 and one which will not. 



May materials which are insoluble in rain water be soluble in 

 soil water? Why j^ (Consult Less. 3.) 



Does warming the water increase its power to make sub- 

 stances soluble ? 



Write a definition of osmosis. (Consult dictionary or some 

 school book on ph^'sics or natural philosoph3^) 



Why does the soil water go into the root-hair ? 



Why does not the liquid in the root-hair flow out into the soil ? 



