PHYSIOLOGICAL PROCESSES IN PLANTS 



References 



Hunter, Essentials of Biology. Chap. VI. 

 Hunter, Elements of Biology. Chap. VI. 



PROBLEM XI 



A study of the conditions ( factors} necessary for awaken- 

 ing (germinating} the embryo in the seed. 



I. FACTORS 



a. Moisture 



Method. Place a layer of moist blotting paper in each of 

 three cups. Put six soaked beans in each. Keep the seeds in 

 one cup about half covered with water, keep those in the second 

 just moistened, and keep those in the third dry. Keep the cups 

 lightly covered, and put in a moderately warm place. Examine 

 them daily for a week or so. 



Observations. Tabulate results as follows : 



NUMBER OF BEANS SPROUTED 



Conclusion. What amount of water do you think is best for 

 germination ? Eeasons ? 



b. Temperature 



Method. Plant equal numbers of soaked peas and beans in 

 each of three germinating boxes or flower pots. Put one box in 

 a warm place, where the temperature is above 80 F., another 

 where the temperature is from 65 to 70 F., and the third where 

 the temperature is at least below 40 F. See that all have tne 

 same conditions of air, light, and moisture. Observe them 

 for a week or two. 



