PART III 



PLANT BIOLOGY 



CHAPTER XX 



TYPICAL FLOWEKING PLANTS 



198. Introduction. — The study of plant biology may 

 begin with any plant. The trees in the park, the grass in 

 the lawn, and the hothouse 



geranium, all respire, use 

 food, and grow. These 

 are plant life processes, 

 and they are similar to 

 the same life processes in 

 animals. 



199. The Bean Plant. — 

 We begin the study of 

 plants with the bean, be- 

 cause it can be grown in 

 the laboratory with little 

 care and because its parts 

 are easy to examine. The 

 whole bean plant, Figure 

 252, is made up of many 

 parts, the roots which 

 hold the plant in the 

 ground and absorb water, 



Figure 252. — Bean Plant. 

 For root details see Figure 261. 



•j.v.i 



