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Show the effect of directional light on ...

Show the effect of directional light on young grass seedlings by Charles Darwin and his son Francis

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Some of the earliest experiments on phototropism were carried out by Charles Darwin and his son Francis in the 1880s. They observed the effects of directional light on young grass seedlings. When grass seeds germinate. The leaves are initially proctected by a cylindrical sheath called a coleoptile. The coleoptiles are ideal for studying phototropism.
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