2.80 Geotropism

• Geotropism= Geo refers to gravity and tropism refers to growth response.
• For example a seed:  
• We find that the embryonic root will grow downwards and this is described as positive geotropism.
• Where as the embryonic shoot will grow upwards towards the soil surface - negative geotropism.

• A different experiment is if you rotate that seed;
• You will see that the embryonic shoot will grow upwards- negative geotropism
• Also that the embryonic root will turn and grow downwards- positive geotropism