Even though the autumn may be unusually warm, the
leaves from deciduous trees begin to drop during
September. Which of the following is the best
explanation?
a. The trees are responding to shorter days.
b. The autumn months are usually drier because the
summer rains have tapered off.
c. The effects of phototropism are operating “right
on schedule.”
d. There is not enough sunlight to carry on
photosynthesis any longer.
e. None of these are the best explanation.
Answer: a
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