PROBLEM 115 139 



Conclusion. — Compare the ferns with other plants in com- 

 plexity of structure. 



e. Flowering Plants 



Method and Observations. — In the flowering plants the sexual 

 generation is reduced to a very small part of the flower, the stamens 

 and pistil. What structures found therein make this the sexual 

 generation ? All the rest of a plant — root, stem, leaves — is the 

 asexual generation. 



Conclusion. — 1. Compare the various structures of a flowering 

 plant with those of the fern, moss, fungus, and alga. 



2. Show that division of labor is greatest in the flowering plant. 



f. Physiological Development 



Refer back to your work on the function of the flower. At 

 the time of f ertihzation, how many cells make up the young plant ? 

 What happens to it as it grows into an embryo ? Is an embryo a 

 more complex structure than an egg? Why? In the above forms 

 is the development of this young plant in any way similar ? (See 

 charts or text figures.) 



General Conclusion. — 1. What group of plants studied has 

 the most complex structure? The greatest division of labor? 



2. Is there any connection between the position of a plant in the 

 plant kingdom and its complexity of structure? Explain. 



Prohlem, 115 : To com/pare reproduction in plants with that 

 in animals. 



Materials. — Charts and models illustrating processes of 

 fertilization and development in plants and animals. 



Method. — Compare, by means of charts, fertihzation in several 

 types of plants with that in some simple animal. Use models 

 illustrating early development of amphioxus, fish, and frog. 



Observations. — How does fertilization take place in a flower- 

 ing plant? In a fern? In a moss? In a very simple plant? 



By what means does the sperm cell get to the egg cell in each 

 of the above cases? Is there any outside agency that helps in 

 this? 



