44 STUDIES OF PLANT LIFE. 
B. Life Problems. 
1. What and where is the first food of the seedling ? 
Experiments 1, 3, 5, 6, and 7. 
2. When and to what extent are exterior plant foods 
(soils) necessary? Why? 
Experiments 2, 3, and 4. 
3. How do differences in moisture, temperature, air, and 
light affect growth ? 
Experiments, with data to demonstrate, 1, 3, 4, 19, and 22. 
4. As growth begins, what changes occur in (a) volume, 
(6) gases, (¢) temperature, and (d) composition? 
Experiments 5, 8, 12, and 24. 
5. Of what substances are seeds composed ? 
Experiments 5, 6,-and 7. 
6. Do dry seeds increase in volume when supplied with 
water? 
Experiment 8. 
7. After beans and some other seeds have been in water 
for a short time, why is the testa wrinkled? After 
further soaking, ae does the testa become 
smooth? 
etic) 8. 
