Which molecule plays the largest role in plant phototropism?

Auxins.

Explanation: Auxins cause differential cell growth based on the presence or absence of light. This means that auxins play a major role in phototropism, the growth of a plant toward the light.

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imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.