BIOLOGY OF HIGHER SEED PLANTS 29 



to be the structure of the cytoplasm in these 

 stamen hairs ? Compare with root-tip cells, 

 (r) The vacuoles. How many vacuoles are there in 

 the stamen-hair cells ? Are the cells all alike 

 in this respect ? Is there a cytoplasmic sac in 

 all stamen-hair cells ? What relation does the 

 nucleus sustain to the vacuole and to the 

 cytoplasm ? 



(4) Draw the following diagrams of a stamen-hair cell 

 to illustrate its form and structure : Draw the 

 cell as it appears when the nucleus is in focus. 

 What kind of view of the cell is this ? Express 

 this view by an appropriate term. Construct a 

 transverse section of a cell as it would appear if 

 cut through the nucleus. 



4. Living stamen hairs and protoplasmic streaming. Mount 

 living hairs of Tradescantia in water and observe with 

 low and high powers for protoplasmic movement. 



a. Lmv-power observations. To what is the color of the 



stamen-hair cells due? Can you 'detect the nucleus 

 and the protoplasmic strands ? Select a good cell 

 for observation, and focus upon it carefully with 

 high power. 



b. Hlijli-power study of living protoplasm and its movements. 



What seems to be the nature of the living protoplasm 

 of a stamen-hair cell ? How would you describe it ? 

 Does the protoplasm exhibit movements ? Is there 

 one general movement of the protoplasm or are there 

 several streams ? Is the movement definitely related 

 to the nucleus ? 



c. Draw a stamen-hair cell showing the position of the 



nucleus and cytoplasmic strands. Indicate by arrows 

 the direction of movement of the protoplasm. 



