When Charles and Francis Darwin first documented phototropism, why was it important that they germinated the grass seeds in the dark before beginning the experiment?

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Growing the grass seeds in the dark ensured that the young shoots would grow straight, eliminating variables such as uneven light exposure that could influence the direction of growth. This setup allowed for a controlled study of phototropism, the directional growth of a plant in response to light.

When Charles and Francis Darwin First Documented Phototropism, Why Was