84 NATURE-STUDY LESSONS. 



7. (a) For the purpose of discovering the uses of the 



roots to a plant, observe the effect of wind on 

 plants and the effect of withholding water 

 from the roots of potted plants. 

 (6) From these observations infer two important 

 uses of roots to a plant. 



8. Mark the position of a trillium in the spring and 

 examine the underground parts late in the autumn. 



9. (a) Compare the underground parts as seen in the 



autumn with those as observed in the spring. 

 (l>) Account for the early blooming of the trillium. 



(c) Compare the trillium in this respect with the 



hepatica and marsh marigold. 



(d) Infer the uses of the rootstock. 

 D. The Stem. 



10. Describe the stem of the trillium. Draw it. 



11. Compare the stems of the trillium, maple, butter- 

 cup and geranium. 



A plant which dies completely down to the ground after flowering is a 

 ierd and is said to be herbaceous. 



12. Using a branch of the maple of nearly equal 

 diameter to the stem of the trillium note similarities 

 and differences in bark and in the arrangement of the 

 internal tissues. 



1 3. (a) Place some fresh stems in water colored with 



red ink or a diamond dye, and describe 



what takes place. 

 (^) Note the parts where staining appears ; and, 



by cutting a stem every fifteen minutes, the 



rapidity of the movement of the colored 



fluid. 

 (c) From this infer how food from the roots is 



conveyed to the leaves. 



