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The roots of a plant grow   he stem.(  )

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way in which hormones are produced by plant  hierarchical nature of the functioning of plant hormones.  differences between the best-known plant hormones.  concept of pleiotropy as it is exhibited by plant hormones.  
To stimulate a particular plant cell to become part of a plant’s root system.  To activate enzymes that release specific chemical messengers from plant call walls.  To duplicate the gene complement in a particular plant cell.  To produce multiple effects on a particular subsystem of plant cells.  
grown; where   to grow; that   growing; where   grown; that  
trace the passage of chemicals through the walls of cells.  pinpoint functions of other plant hormones.  artificially control specific aspects of the development of crops.  alter the complement of genes in the cells of plants.  
at the top of    in the bottom of    in the middle of    at the beginning of  
Interacting with one another to produce different chemicals.  Pleasing specific chemical messengers from a plants cell walls.  Reoducing the hormones that cause plant cells to differentiate to perform different functions.  Influencing the development of a plant’s cells by controlling the expression of the cell’s genes.  
it is not known exactly what functions the hormones perform  each hormone has various effects on plants  none of the hormones can function without the others  each hormone has different effects on different kinds of plants  

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