Group III 



11. What would be the necessary steps in the process of producing a hybrid 



fruit ? 



12. (a) Which of the algae may be the cause of the disagreeable odor and taste 



of reservoir water ? How can this condition be remedied ? (b) Why 

 are the diatoms an interesting and important group ? (c) What use is 

 made of kelps at the present time ? 



13. Explain how in improving wheat or any other crop, by selection or breeding, 



(a) the demands of the market, (b) the farm or home needs, and (c) the 

 climatic conditions must be considered. 



14. (a) What is cellulose ? (b) Name a substance which is almost pure cellulose. 



(c) What articles of commerce are made from cellulose ? (d) Which of 

 our foods contain a great deal of cellulose ? 



15. What is the United States government doing: (a) to conserve our forests; 



(b) to introduce new kinds of plants; (c) to control the spread of plant 

 diseases ? 



>9 



