GROWTH 153 



485. Does it pay to take good care of an apple tree on the years in 

 which it does not bear heavily? Explain. 



486. By what methods would you encourage a plant to flower? 



REFERENCE PROBLEMS 



72. Are all the chromosomes in a plant cell exactly alike? 



73. Give an example of a food product which is derived from a i)lant 

 growing-point. 



74. What are the differences between propagating plants by cutting, 

 budding, and grafting? 



75. In grafted trees, docs the stock have any effect on the growth and 

 character of the branch that develops from the scion? 



76. How are "dwarf" fruit trees produced? 



77. What is meant by the "polarity" of a branch? 



78. At what time of the year is it determined whether a bud which is 

 forming on an apple tree will be a leaf bud or a flower bud? 



79. Give the derivation of the following terms and explain in what way 

 each is appropriate: 



Mitosis Meristem Chromosome 



