Phototropism and geotropism

Priciple and tasks:

To test the reaction of shoots, leaves and roots of higher plants to light stimuli (photoperiodism) and to stimuli caused by the earth's field of gravity (geotropism). To measure the alignment of shoot, leaf and root of bean seedlings which sprout in a vessel standing on the ground or lying on its side. To eliminate the effect of light or gravity by rotation in a clinostat aligned in the vertical or horizontal position.

What you can learn about:

• Photoperiodism
• Phototaxis
• Clinostat
• Negative and positive phototropic response
• Geotropism
• Geotaxis
• Statoliths

Literature for this article als follows

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