What would happen if the liquid in the root-hair and that in 

 the surrounding soil were of equal density ? 



Must all food materials in the soil be in solution before the 

 plant can use them ? 



Does the plant ever utilize materials which are insoluble in the 

 soil water ? How ? 



How is it that plants can live and grow in a soil which is 

 dust drv ? 



Can your soil be so loose as to have too much air for the good 

 of the plants ? 



Do you understand that you can smother the root as well as 

 the top of the plant ? How ? 



At what season do you suppose that corn roots absorb the most 

 moisture ? 



At what season do vou have the least rainfall? 



