2 68 Why Living Things Behave As They Do unit v 



Further Activities in Biology 



1. Can you think of any human reflexes that you could demonstrate 

 to your classmates? 



2. Study the instinctive behavior of some animals you can watch 

 closely — perhaps ants, bees, spiders, caterpillars making cocoons, birds, 

 and so forth. 



3. If you have seen the response of a protozoan to light, it would be 

 interesting to discover whether certain rays call forth more of a response 

 than others. You may use prisms or photographic filters to obtain the 

 light rays you wish to test. 



4. Do paramecia respond to gravity? Plan an experiment to find out. 

 (Hint: Use a long, narrow tube.) Can you devise a control? Discuss this 

 with your classmates. 



5. What would paramecia do if two stimuli with opposite eflfects were 

 applied at the same time? Light and gravity might be tested. Present 

 your results to the class. 



6. Using a U-tube and one or two dry cells, devise an experiment to 

 test the response of Paramecium to an electric current. What is your 

 control? Explain. 



