52 PLANT PHYSIOLOGY 



QUESTIONS 



1. What are mitochondria and chondriosomes? 



2. How can the chlorophylls be separated from the carotinoids? 



3. How are the chlorophylls separated from each other? 



4. How is xanthophyll separated from carotin? Name specific solvents 

 in each case. 



5. What are esters? Give examples. 



6. Plants grown on serpentine soil seem to be especially rich in chlorophyll. 

 Explain. 



7. One sees in newspapers many advertisements of iron as a cure for 

 anaemia. Is there any basis for such advertising? 



8. Why do autumn leaves often turn yellow? 



9. In the winter time more artificial butter coloring is needed than in 

 the summer. Why? 



10. Why is butter yellow instead of green? 



11. What seems the most logical source of the blood materials in animal 

 metabolism? 



REFERENCES 



Armstrong, H. E— Richard Willstatter. Nature, 120:1, 1927. 



Forster, M— The laboratory of the living organism. Nature, 108:243, 1921. 



Heilbron, I.— Plant pigments. /. Soc. Chem. Ind., 43:89, 1924. 



Mottier, D. A. — Chondriosomes and primordia of plastids. Ann. BoL, 



32:91, 1918. 

 Willstatter, R. M., and Stoll, A.— Investigations on chlorophyll: methods 



and results. (Transl. by F. M. Schertz, U. S. A. Dept. of Agric.) 1928. 

 Wurdack, J.— The natural plant coloring matters. J. Am. Pharm., 13:307, 



1924. 

 Zirkle, C. — The structure of the chloroplast in certain higher plants. Am. 



Jour. BoL, 13:301, 1926. 

 The growth and development of plastids in Lunularia vulgaris, 



Elodea canadensis and Zea mays. Am. Jour. Bot., 14:429, 1927. 



