How Plants Live 



The energy of the sunlight, 

 oxygen for respiration, and car- 

 bon dioxid for photosynthesis 

 are received by the leaves. 



Water vapor, oxygen from pho- 

 tosynthesis, and carbon dioxid 

 from respiration are given off 

 by the leaves. 



The stem transports ma- 

 terials between the leaves 

 and the roots. Water and 

 raw food materials pass up 

 to the leaves, and food 

 passes down from the 

 leaves to the roots. 



Oxygen, water, and raw food ma- 

 terials that are dissolved in the 

 soil water are taken in by the 



roots. 



Carbon dioxid is given off by the 

 roots. Probably substances that 

 help to dissolve raw food mate- 

 rials in the soil are also given off. 



FIG. 24. Diagram illustrating the work of the different parts of a plant. 



