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Why do plants have green leaves and not red?
I would like to point to a dissuasion that took place at John Baez's google+ on the subject plus.google.com/117663015413546257905/posts/emyoML3CrvY It contains relevant links along with references to actual articles devoted to the question. This is a nice point to begin further investigation.
Why are mosquitoes repelled by smoke?
that's a probable mechanism, but not the reason. Why are they repelled by citronella oil?