PROBLEM I . The Fart Leaves Play 



energy. Animals and the colorless plants 

 use up the stored energy in growing and 

 keeping alive. 



Lastly green plants, besides making 

 foods containing energy, put free oxygen 

 into the air. In photosynthesis much oxy- 

 gen is set free. To be sure some remains 



m Making Food 145 



in the plant and is used in oxidation but 

 large amounts are left over. This extra 

 oxygen diffuses into the air. Thus animals 

 and colorless plants are dependent on 

 green plants for food, for all their energ\ 

 supply, and for the continued supply of 

 oxygen. Now try Exercise 6. 



PHOTOSYNTHESIS 



RESPIRATION 



Materials Used 

 Materials Produced 

 Energy Changes 



When Occurring 

 Where Occurring 



Carbon dioxide and water 



Sugar and oxygen 



Light energy changed to 

 chemical energy of sugar 



Only in light 

 Only in green cells 



Food and oxygen 



Carbon dioxide and water 



Chemical energy of food 

 changed to other kinds of 

 energy 



At all times 



In all living cells 



Questions 



1. What evidence have you that green plants do not get their food from 

 the soil? 



2. How do leaves vary in shape and size? Describe the veining in the 

 blade of a monocot and in the blade of a dicot. Sketch three leaves to 

 illustrate "feather" veining, "palmate" veining, and parallel veining. 



3. What in a leaf blade occupies the place of the two slices of bread 

 in a sandwich? What in the leaf takes the place of the sandwich fill- 

 ing? Locate spongy cells, palisade cells, veins. 



4. Describe stomata, giving their appearance and location. 



5. Distinguish between chlorophyll and chloroplast. 



6. What elements are found in chlorophyll? How can you ^et the 

 chlorophyll out of a leaf? Explain the effects of light on chlorophyll. 



7. Explain what useful work chloroplasts do. To what extent can man 

 duplicate this work? 



8. Give one example of an energy change in a factory and another in 

 a green leaf. What simple compounds are combined in making sugar? 

 What substance is left over in this process? What does the word 

 "photosynthesis" mean? 



9. What elements are contained in sugar? in protein? What is combined 

 with sugar when protein is made? When sugar is synthesized into 

 protein what simpler substances are produced first? What use does 

 the plant make of protein? 



10. Name three plants which contain large amounts of fat. From what 

 is fat made in the green plant? 



