Tackling Tropisms: Gravitropism and Phototropism

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This set of demonstrations into the effects of tropisms on seedlings is both simple and extendable. Seeds sown on damp cotton wool in Petri dishes are grown either flat, or stuck vertically to a wall, showing the different effects of gravitropism. After a week, students compare the seeds in this dish with those in the control dish and see that the cotyledons have grown upwards and the roots downwards. There is an extension activity to investigate the effect of phototropism.

This resource was produced by Science & Plants for Schools (SAPS).

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