44 PHYSIOLOGICAL PROCESSES IN PLANTS 



3. Do you find mouth parts fitted for biting (jaws), or for 

 sucking, or both ? 



4. Are the legs segmented (jointed) ? What structures do 

 you find on the feet? 



5. Are the legs smooth or hairy ? If hairy, which segment 

 is the most so? 



Conclusions. 1. What do you think is the purpose of 

 joints in the legs ? What would be the result if there were 

 no joints? 



2. What do you think is the purpose of hooks on the 

 feet? 



3. Could the hairy legs hold pollen ? Which segment 

 could carry the most, if any ? 



4. How do you think an insect may be an aid in cross-fer- 

 tilizing flowers ? 



5. How does a flower serve the bee ? How, in turn, does 

 the bee serve the flower ? 



c. Field Work (Optional) 1 



1. GENERAL WORK 



Observations. 1. Visit a locality where flowers are abundant. Are 

 they being visited by insects ? 



2. Can you tell what sort of insects ? Are they few or abundant ? 



3. Do bees visit flowers of one sort in succession, or of different 

 sorts? 



4. If butterflies are present, try to determine as for the bees. 



5. Describe any peculiarities of the flowers visited by the bees, such as 

 irregularity, strong perfume, nectar, etc. 



Conclusions. 1. Write out a report of your observations in a note- 

 book. Bring it to class conference for discussion. 



2. What is evidently the purpose of irregular flowers ? Of nectar ? 

 Of perfume ? 



i It would also be interesting to see if any flowers prevent pollinating 

 their own pistils, or if there are any devices for preventing the visits of 

 unsuitable insects. 



