522 Introduction to the Study of Science 



REVIEW QUESTIONS 



I. What is one of the important differences between plants and 

 animals? 2. What are the sources of the materials used by plants 

 in food manufacture? 3. By what organs do plants take carbon 

 dioxid from the air? 4. To what is the color of the leaves due? 

 5. What is the function of chloroplasts ? 6. What is the first food 

 produced in the leaf ? The second ? 



7. How can you prove the presence of starch? 8. (a) What is the 

 relation of sunlight to starch production? (6) How can you prove 

 your answers? 9. (a) Mention some carbohydrates. (6) Of what 

 are they composed ? 10. (a) What is the meaning of photosynthesis ? 

 (6) Where does it take place ? (c) By what agencies ? 



II. (a) Of what simple substances are proteins composed? 

 (6) Where are they found in a plant ? (c) How may their presence be 

 indicated? 12. What chemical change takes place in barley when it 

 sprouts? By what is this change effected? 13. (a) Why does the 

 starch disappear from the leaves at night? (6) Is starch soluble in 

 pure water? (c) What does cell sap contain which makes starch 

 soluble? (d) In what conditions is the diastase especially active? 

 (e) What is the product of the action of diastase on starch ? 



14. (a) How may starch be converted into sugar in the laboratory? 

 (6) How is the acid finally neutralized? 15. What uses do plants 

 make of the food they manufacture? 16. Mention several ways in 

 which plants store food. 17. How can you prove the presence of 

 starch in the stores of food which the plants make ? 



