34 FIRST YEAR COURSE IN GENERAL SCIENCE 



(5) Can you pull up the entire plant without breaking any 

 part of it, if you are careful? 



(6) From this observation (No. 5), what do you conclude 

 to be one of the uses of roots to the plant? 



(7) Are the pulled roots clean? 



(8) What is their color before washing? 



(9) How do the roots look after they have been washed 

 in the bottle? 



(10) Can you account for this by recalling the description 

 of root hairs, or those on the young plant which you studied 

 at home? 



(11) Is one root larger and thicker than the others? 



(12) If so, how does it seem to be related to the stem? 



(13) What position do the small roots have in relation to 

 the large root? 



(14) What would the roots of your plant measure if cut 

 off and placed end to end? (Measure two or three roots 

 and then estimate the total root length.) 



EXERCISE XXVI (Textbook 300) 

 STUDY OF THE STEM AND LEAVES OF A PLANT 



MATERIALS: The same plant used in the previous exer- 

 cise; it should be kept in a bottle 'with enough water to 

 cover the roots. 



(1) Make a drawing of the plant, on the first page of your 

 notebook sheet. 



(2) What organs are borne on the stem? 



(3) What organ serves as a connection between root and 

 leaves? 



(4) What, then, do you conclude to be two uses for stems? 



(5) How would a plant change in appearance if the soil 

 should remain dry for a short time? 



(6) Then if the soil is watered, what is the result? 



J 



