3o6 BIOLOGY AND HUMAN LIFE 



QUESTIONS 



1. What kinds of living things can be entirely independent of other 

 organisms ? Why ? 



2. What kinds of organisms must be dependent upon others ? Why ? 



3. In what ways can living things be of use to other species ? 



4. Why cannot all living things be entirely independent of others ? 



5. Why cannot all living things prey upon others ? 



6. Why cannot all living things be parasites ? 



7. In what ways can parasites cause injury to living things ? 



8. How can parasites be of service to other species ? to the host ? 



9. Could people live indefinitely on an artificial island without 

 plants ? If so, would they be independent of plant hfe ? 



10. What should you consider the food relation between man and 

 sheep ? Why ? Between the bee and the clover plant ? Why ? Betweea 

 man and the cow ? Why ? 



IL Why are there more parasites among microbes than there are 

 among larger plants and animals ? 



12. Why are larger plants and animals more exposed to parasites than 

 smaller ones? 



13. Why is it important to distinguish between symptoms and causes 

 of disease ? Why is it important to know both the symptoms and the 

 causes of diseases ? 



REFERENCE READINGS 



Conn, H. W. Bacteria, Yeasts, and Molds in the Home, chap, xiv, Dis- 

 ease Bacteria. 



Hough and Sedgwick. The Human Mechanism, chap, xxxi, Com- 

 municable Diseases. 



CocKERELL, T. D. A. Zoology, chap, xxvi. Protozoa and Disease; 

 chap, lix, Louis Pasteur. 



Supplement 30, Public Health Reports, Description of Common Colds. 



Farmers' Bulletin 1330, Parasites and Diseases of Sheep. 



Farmers' Bulletin 1337, Diseases of Poultry. 



Farmers' Bulletin y8i, Tuberculosis of Hogs. 



United States Bureau of Fisheries. Report for 19 18, Appendix 5, The 

 Flatworm as an Enemy of Oysters. 



Pubhc Health Reprint 811, Louis Pasteur. 



