PART II 



PLANT ACTIVITIES 



HAVING studied the construction of the plant as a machine, 

 we will now study the working of the machine, or the physiology 

 of the plant. This involves the taking in of water and soluble 

 salts from the soil and gases from the air ; the absorption of the 

 energy of sunlight ; the response of the plant to its environment ; 

 the many and various processes of growth and reproduction ; and 

 the giving off of waste materials. 



