2.80 Geotropism

- Geo = gravity, tropic = growth response
- An example: seed:
- the embryonic roots grow downwards, this is described as positive geotropism
- the embryonic shoot will grow upwards, this is negative geotropism

- Further experiment: take the same germinating seed and rotating it anti-clockwise to face upwards.
- The shoot grow upwards showing negative geotropism
- The roots will grow downwards showing positive geotropism