28 LABORATORY AND FIELD EXERCISES 



basal portion of the hair ? How are the cells joined at 



the ends ? Have they cell contents ? See root-tip cells. 



a. Draw a figure illustrating the form and appearance of 



the cells of a stamen hair as seen under low power. 



Label all parts observed. 



3. High-power study. Select large cells near the base of a 

 stamen hair in which the internal structures are plainly 

 visible. 



a. Compare the structure of such stamen-hair cells with 

 that of root-tip cells as regards the following points : 



(1) Cell shape and outline. How do stamen-hair and 



root-tip cells differ in form and outline ? Can you 

 think of a reason for the differences you see ? 

 What is the geometrical form of a stamen-hair 

 cell at the larger basal end of the hair ? at the 

 smaller apical end ? 



(2) Cell wall. Is the cell wall smooth or roughened? 



thick or thin ? colored or colorless ? 



(3) 'Cell contents. 



(a) The nuclei. Where are the nuclei located in 



different stamen-hair cells ? Have they the 

 same position in all cells of a single hair ? 

 Can you determine by focusing whether the 

 nucleus is in the center of the cell or next 

 to the cell wall ? Try this experiment in 

 different cells. Eesult ? Be able to explain 

 to an instructor. 



(b) The cytoplasm. Do you find cytoplasm around 



the nucleus ? How is it disposed in other 

 parts of the cell ? Is it denser in some areas 

 than in others ? What is the character of the 

 cytoplasm as seen under high power ? What 

 parts of it are visible ? What do you conceive 



