What is the natural role of nicotine in tobacco plant?

it is poisonous to insects
it attracts bees
it is an useless by-product
it moisturizes leaves
Nicotine is a pow­er­foul neu­ro­tox­in to insects. Many plants other than tobacco contain it, however the con­cen­tra­tion of nicotine in tobacco is ex­cep­tion­al­ly high. Even though some species have evolved the ability to feed on tobacco, it remains rel­a­tive­ly easy to grow, being un­palat­able to most species. In some places, tobacco became an invasive weed.

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it is poisonous to insects
it attracts bees
it is an useless by-product
it moisturizes leaves
answers
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Gender

men65%
women69%
it is poisonous to insects
65%
69%
it attracts bees
9%
6%
it is an useless by-product
10%
8%
it moisturizes leaves
14%
14%

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What is the natural role of nicotine in tobacco plant?
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