64 



BIOLOGY FOR BEGINNERS 



and tilted at an angle of about 45 degrees, the direction taken by 

 the roots will be different from what might have been expected 

 from the above experiment. 



. 

 LIQ.UIO 



teas DCft 



I.IOUIO 



SI/CrAft 



SOLUTION 



__. 



//v 



HOOT - N 



CELL WALL 



SOt L. 



i WATE K 



FIGS. 12 and 13. Osmosis in root-hair. Laboratory experiment to 

 demonstrate osmosis of liquids. 



The roots will start downward at first, directed by gravitation, 

 but when they have penetrated the sieve, they will turn toward 

 it again and reenter the moss in order to find moisture. 



