54 THE SIMPLEST ANIMALS — PROTOZOA 



SUMMARY 



Protozoa are the simplest group of animals. They are 

 found mostly in water, yet some are parasitic in higher 

 animals. They are small and usually consist of only one 

 cell. They reproduce mostly by fission. Some produce 

 in man and beast diseases, such as malaria and the sleeping 

 sickness of Africa. But the great majority of Protozoa 

 are not harmful. 



QUESTIONS 



Compare the body of a protozoan with the body of a grasshopper. In 

 what are they alike ? In what different ? 



How do the amoeba and paramcecinm compare ? 



Explain how the Protozoa eat, digest food, produce more Protozoa, 

 and protect themselves. 



How do these vital processes compare with the similar vital processes 

 in the grasshopper ? 



In what ways are Protozoa injurious to man ? Are they parasitic ? 



REFERENCES 



Galloway, First Course in Zoology, Chapter X. 

 Hegner, Introduction to Zoology, Chapters IV, V, VI. 

 Jordan and Kellogg, Animal Life, Chapters II, III. 

 Kellogg, Animals and Man, Chapter V. 

 Osborne, Economic Zoology, Chapter II. 



