74 ROOTS 



5. Where do root hairs grow most abundantly? Where are they largest? 



6. How could you prove that root hairs give off acid? 



7. Distinguish clearly between diffusion and osmosis. 



8. What is meant by osmotic pressure and how might it be brought about ? 



Problem and Project References 



Hunter, Laboratory Problems in Civic Biology. American Book Company. 

 Coulter, Barnes, and Cowles, A Textbook of Botany, Part II. American Book 



Company. 

 Duggar, Plant Physiology. The MacmiUan Company. 

 Goodale, Physiological Botany. American Book Company. 

 Transeau, General Botany. World Book Company. 



