ANATOMY AND PHYSIOLOGY 



think so? What change does it undergo in order 

 to become visible on the surface of the beaker? 

 In what state does it probably exist in the leaf? 

 State one reason why the plant lost weight in 

 Experiment i. Was this the only cause of its loss 

 of weight? 



6. The above experiments demonstrate the fact of 



transpiration. Give a definition of transpiration. 

 B. The Control of Transpiration: 



Experiment 3. To see if the epidermis affects the rate 

 of transpiration. 



i. Take two sound apples. Remove the skin (epider- 

 mis) from one of them, then ascertain accurately 

 and record the weight of each, in tabular form, as 

 follows : 



2. Place the specimens in a convenient place, with free 

 access of air, and out of reach of mice. 



3. Record, in a table like the above, three (or more) 

 subsequent observations of weight at successive 

 class periods. 



4. Plot two curves showing the rate of loss of weight. 

 Include these curves and their interpretation as 

 part of your record of the experiment. 



Experiment 4. To demonstrate the effect of the 

 "skin" of a potato- tuber on transpiration, 



