A houseplant placed in a window grows toward the
source of light because auxin
a. becomes more concentrated on the illuminated
side of the plant.
b. becomes more concentrated in the roots of the
plant.
c. becomes more concentrated on the
nonilluminated side of the plant.
d. inhibits the growth of cells on the shady side, so
the cells on the sunny side grow faster.
e. does none of these.
Answer: c
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