Geotropism Lab

Stark County BSAA Plant Science class places corn, soybean, and wheat seeds in petri dishes with wet paper towels. The petri dishes are placed in a box on edge. As the roots and shoots emerge, students sketch the direction of growth. Roots demonstrate positive geotropism (downward growth). Shoots demonstrate negative geotropism (upward growth). Halfway through the experiment, the dishes are turned upside down and the students check to see if the roots and shoots compensate for the change in direction.

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