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The researchers have not yet identified the genes involved in heliotropism.

It’s heliotropism, and sunflowers are not the only plants that track the sun.

But light sensitivity—or heliotropism—plays a role too.

He defines "List" as "an attitude resulting from the rotation of the insect about its longitudinal axis, as heliotropism results from a rotation about an imaginary vertical axis at right angles to this."

Since plants possess no nerves, this identity of animal with plant heliotropism can offer but one inference—these heliotropic effects must depend upon conditions which are common to both animals and plants.