36 INTRODUCTION 



4. Explain the use of plants in clothing. 5. Explain the use of plants 

 as fuel. 6. Explain the use of plants in connection with the produc- 

 tion of electricity. 7. Explain other uses of plants to man in addition 

 to the uses for food, clothing, and fuel. 8. Mention the substances 

 derived from plants which you yourself have used to-day. 9. Men- 

 tion the kinds of business in your community which depend directly 

 upon plants and the products of plants. 10. What foods sold by 

 the grocer come from our own country and what from foreign coun- 

 tries? ii. Mention the plants principally used for timber. 12. 

 What are some of the ways in which plant life and animal life are 

 alike ? 



SECTION 2. i. What kinds of plants principally form the natural 

 covering of the soil ? 2. What are the most abundant plants in the 

 country round where you live ? 3. How do plants get started on soil 

 which is bare ? 4. What is the principal cause which may prevent 

 soil from having its natural covering? 5. Describe the appearance 

 in summer of the farm land round where you live as you might see 

 it from a balloon. 6. What are the principal crops in the county in 

 which you live? 7. Explain why knowledge of plant life may be of 

 value to you apart from its value in making a living. 8. Seeds are 

 the principal means by which plants are started. Do you know any 

 other ways in which they are started ? If so, describe them. 



SECTION 3. i. Describe some of the things you have noticed 

 about plants in spring. 2. About what tune do the leaves begin to 

 appear, and what are the plants whose leaves appear first? 3. Do 

 you know any plants whose flowers appear before the leaves, and can 

 you think of any advantage in this habit ? 4. What are the first 

 wild flowers you have noticed ? 5. What are the first cultivated flow- 

 ers to appear ? 6. What are three of the things necessary to plant 

 life as well as to your own life ? 



SECTION 4. i. What are the two great kinds of changes which 

 have occurred in plants ? 2. Describe the relation of primitive men 

 to plants. 3. Describe the beginnings of the cultivation of plants. 

 4. Explain the statement that "society grew out of waiting for the 

 crops." 



SECTION 5. i. What are some of the ways in which farmers 

 learned to improve their crops? 2. Where are plants like the an- 

 cestors of wheat and corn found ? 3. What is it that makes agricul- 



