424 LIFE ON THE EARTH 



What do the leaves do for the plant ? How do they do it ? 



What is the value to the plant of the flower ? How are the flowers 

 prepared to carry out their part in the life struggle of the plant? 



Describe any way in which you know that animals have been of 

 assistance to plants. 



How do plants provide for the dispersal of their seeds? 



How does the seed develop into a plant? 



With what useful or what harmful chlorophyll-lacking plants 

 have you ever had experience? 



Name and describe some of the invertebrate animals you know. 



What is the general structure of the worm ? 



What insects have you known that are beneficial ? W T hat that 

 are harmful? 



What is the use to the vertebrate of the skeleton and the nervous 

 system ?. 



Describe how vertebrate animals breathe. Why is it vitally 

 necessary for them to breathe freely? 



What is the use of the blood ? How does it get around to where 

 it is needed? 



Describe the ways in which man becomes aware of what is 

 outside his body. 



Why is food needed? How and where is it digested? 



