Compared with young trees growing out in the open,
young trees growing in a darker forest understory
tend to have longer, thinner trunks with less
branching. This developmental pattern is principally
caused by
a. phototropism.
b. thigmotropism.
c. activated phytochrome being converted to
inactive phytochrome.
d. inactive phytochrome being converted to active
phytochrome.
e. none of these.
Answer: c
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