Illustrate the coleoptiles tip experiment.

The coleoptile tip experiment, first conducted by Charles and Francis Darwin in the late 19th century, was a key experiment in plant biochemistry that helped establish the role of auxins in plant growth. The coleoptile is a protective sheath covering the shoot tip of grass seedlings, particularly monocots, which ensures the delicate growing tissue is shielded as it pushes through the soil. The experiment sought to understand how light affects the growth of plants, particularly how the coleoptile responds to directional light.

To illustrate the coleoptile tip experiment, the setup involves the following steps:

1. Seedling Preparation: The experiment begins with germinating seeds, typically of oats, ____ ___ ______ _________ _____ ____ ________ ________.
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