148 FOOD 



and held in place by stakes which are driven into the 

 ground. 



The illustration gives a plan for a garden on a city 

 lot, about fifty by ninety feet, and shows one method of 

 following early crops with late crops. The plan will 

 depend upon the locality. Full directions for planting 

 will be found on each envelope of seeds* You have 

 learned in general what to do, and you have also learned 

 why you do it. 



Review Questions, 25. 



1. What effect has sunlight upon plants? How 

 can you prove your answer? 



2. Are there any plants, either large or small, 

 which are harmed by sunlight? Is this an advantage to 

 us or is it a disadvantage? 



3. How can you prove that plants require heat in 

 order to grow? 



4. How do you know that plants need air? What 

 part of the air do the leaves take in? What part of the 

 air do the roots use? Can the roots take this part of the 

 air without some help? Explain. 



5. How do plants help man? 



6. How do plants obtain the water which they need 7 

 What is the harm of too much water? 



7. Do all plants grow in the ground? Explain. 



8. Tell about the harmful plants. What can we do- 

 to protect ourselves from them? 



9. Name the three kinds of food' material: fop man. 



