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Which of the following is the best example of chemical coordination occurring specifically in plants, as distinct from nervous coordination in animals?

Question
Which of the following is the best example of chemical coordination occurring specifically in plants, as distinct from nervous coordination in animals?
A reflex arc withdrawing a hand from heat
Auxin diffusing to the shaded side of a shoot to promote bending towards light
Adrenaline increasing heart rate during fear
A neuron transmitting an electrical impulse across a synapse
Answer
Auxin diffusing to the shaded side of a shoot to promote bending towards light
Detailed Explanation
Auxin-mediated phototropic bending is a clear example of plant hormonal (chemical) coordination, distinct from the nervous or hormonal coordination mechanisms found in animals.
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