1918 

 ZOOLOGY 



Friday, June 21 2 p.m. Two hours 



Answer three questions from each group, and one additional question which may be 

 selected from any group. 



Group I 



1. Describe fully the organs used by some insect in the process of breathing, and 



explain how these organs work. 



2. Compare the general plan of the body structure of a coelenterate, an 



annelid, and a vertebrate, 



3. Describe the sense organs of (a) an annelid, (b) an insect, (c) a crayfish or a 



mollusk, and (d) a fish or a frog, explaining the function of each. 



4. Explain with diagrams the cell structure of (a) bone, (&) muscle, and (c) blood. 



5. Compare the characteristic method of locomotion and the organs concerned 



in a fish, a frog, and a bird. 



Group II 



6. Describe the processes oi reproduction and regeneration in Hydra. 



7. Define each of the following terms and give an example of its use: 



(g) parasitism, (b) protective resemblance, (c) segmentation, (d) special- 

 ization, (e) struggle for existence. 



8. Illustrate by concrete example what is meant by Mendel's Law of Heredity. 



9. (a) Describe the life cycle of the mosquito. 

 {b) What is the food of this insect ? 



(c) What are its enemies ? 



(d) What is its importance to nian ? 



10. Describe in detail the various steps that take place from the time that the egg 



cells and sperm cells of a fish, or a frog, are deposited in the water until 

 the gastrula stage is formed. 



Group III 



11. Give the life-history of a protozoan that lives in human blood. 



12. What is the principal food of five of the following birds and how does each 



secure it: woodpecker, owl, robin, quail, humming-bird, English sparrow, 

 chickadee ? 



13. If you were a fruit farmer, what animals would you try to secure on your 



farm and what animals would you try to exterminate ? Give reasons. 



14. Name three animal parasites that cause human disease. Show in each 



instance the method of infection and the- means of prevention. 



15. Describe methods by which the supply of available animal food for man may 



be increased in the United States. 

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