Illustrate the coleoptiles tip experiment.

The coleoptile tip experiment, conducted by Peter Boysen-Jensen in 1913, is a classic study in plant biochemistry that demonstrated the role of plant hormones in growth and development. This experiment provided foundational evidence for the concept of "growth substances" now known as phytohormones, particularly auxins. Here’s a detailed explanation of the experiment and its significance:

### Experimental Setup

1. Material Selection:
The experiment utilized coleoptiles, which are the protective sheaths covering the emerging shoot in grasses and some other monocots. The coleoptile is particularly useful due to its simple structure and sensitivity to light and hormones.

2. Initial Observations:
Boysen-Jensen began by observing that when a coleoptile was exposed to unilateral light (light from one side only), it curved towards the light source. This curvature was an important observation that indicated a directional growth response, known as phototropism.

3. Experimental Procedure:
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