PROBLEM 18 



47 



what happens? What would one use of the roots be? What 

 holds a plant in the ground? In seedlings the roots of which 

 have been placed in red ink note carefully the appearance of root, 

 stem, and leaves. Note that the red fluid extends into the leaves. 

 How did it get there ? W^at is one use of the stem to the plant ? 



Examine a piece of sugar cane, a stem. Taste it. What does 

 it contain ? What might another use of stems be ? 



Examine leaves which are in a sunny window. How are they 

 placed with reference to the light? Later we will find that green 

 leaves make food for the plant when in the sunlight. 



We have seen flowers, and found that in time they form fruits. 

 Fruits in turn hold the 

 seeds which give rise 

 to new plants. 



Conclusion. — 1. 

 Write a short compo- 

 sition on the uses of 

 all of its parts to a 

 green plant. 



2. Fill in a table like 

 the accompanying. 



Problem 18: To study the needs and uses of the parts of a 

 living animal. 



Method. — Study your pet cat or dog. Make a list of all the 

 things that your pet requires in order to live. Classify the intake 

 of the pet under the headings. Food, Water, Air, etc. 



What parts of the body have to do with taking in food ? Water ? 

 Air? When a structure has a work to do, we call that work its 

 function. What other functions has your pet besides those already 

 mentioned? (Your teacher will help you here.) 



Conclusion. — What are the needs and what are the functions 



of a living animal? How do you think they compare with those 



of a plant? 



STUDY OF COMPOUND MICROSCOPE 



1. Note. — The microscope, an instrument for making smEfll objects appear 

 larger, comprises two parts: the stand (A, B, C) and the lenses (F, G). 



