2.80 Geotropism

Key Points:

1. Geotropic responses are growth responses to gravity
2. An example is that in a seed, the embryonic roots grow downwards, and this makes it positively geotropic, or makes positive geotropism
3. And in the seed, the embryonic shoot will grow upwards, making negative geotropism
4. If the seed is rotated, the embryonic roots will continue to grow downwards showing positive geotropism, as will the embryonic shoot, which will grow upwards making negative geotropism
5. This shows that no matter which way you turn the seed, it the shoot will always grow upwards, and the roots will always grow downwards, showing the growth responses to gravity from the seed