68 



PHYSIOLOGICAL PROCESSES IN PLANTS 



3. Compare jars 2 and 3. Which plants are the most vigorous? 

 Which pushed through the greater amount of soil ? 



4. What is shown in Figure 13 ? 



Conclusions. 1. How is the size of seeds related to the early seed- 

 ling ? 



2. What relation between the size of seeds and depth of planting? 

 Explain. 



123 



FIG. 13. Large versus small seeds. Jar 1, navy beans planted one inch 

 deep; jar 2, clover seeds planted one inch deep; jar 3, clover seeds planted 

 one quarter inch deep. 



3. Give at least three reasons why farmers should reject small and 

 shrunken kernels of corn. 



4. What precautions should usually be observed in selecting seed ? 



c. Hereditary Percentage, or the Number of Offspring that 

 Inherit Desired Characters 



Observation. After the sprouting power of the seeds is deter- 

 mined, the seeds from particular ears are planted in particular rows, so 

 that the offspring of these ears can be compared. 



Conclusions. 1. The poor and barren stalks are now removed be- 

 fore the tassels appear. Why ? 



2. Why should this testing lot be separated a mile or so from other 

 fields of corn ? 



3. In the autumn the best ears are now selected for next year's crop. 

 These selections depend upon the line of improvement desired. 



