Compared with Young Trees Growing Out in the Open, Young

question 5

Multiple Choice

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.

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