In tobacco tissue culture, getting both roots and shoots to develop requires
a. an auxin-to-cytokinin ratio of 10:1.
b. a higher concentration of cytokinin than auxin.
c. an auxin-to-cytokinin ratio of slightly greater than 10:1.
d. an intermediate auxin-to-cytokinin ratio.
e. exactly equal amounts of auxin and cytokinin.
D
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