82 AN INTRODUCTION TO THE STUDY OF FOSSILS 



1. What is the especial feature that characterizes the angio- 

 sperms ? What is the difference, indicated by the derivation of 

 the words, between angiosperms and gymnosperms ? 



2. Describe a typical flower. 



3. Outline the method of fertilization. 



4. What is the sporophyte stage of an angiosperm ? What 

 the gametophyte ? How does their relative importance among 

 angiosperms compare with it among the mosses ? Among 

 the ferns ? 



5. In what geologic age did angiosperms appear ? 



6. How are angiosperms divided? 



7. Name three features which distinguish a monocotyledon 

 from a dicotyledon. 



8. Discuss one example of the former class, giving its geo- 

 graphic and geologic range. 



9. Discuss one example of the dicotyledons, giving geographic 

 and geologic range. 



1. Name the divisions into which plants are classified, giving 

 the basis of this classification. How does the increase in com- 

 plexity of organization correspond to the order of appearance 

 in geologic time ? 



2. Outline the changes in the relation of sporophyte to 

 gametophyte stages from the thallophytes to the spermato- 

 phytes. 



3. In what mineralogical state do the majority of fossil 

 plants occur? Outhne the process which changes the living 

 tissue of the plant to this condition. 



