The sequence of stages of pea seed germination.

The pea seed begins to germinate even under the ground. Under the influence of water and nutrients, the peas begin to grow. But even if the seed is planted upside down, the plant will begin to grow downward and then unfold, and begins to grow in the direction opposite to the gravitational field of the Earth. After the pea sprout has chosen the correct growth direction, it emerges from the ground. As soon as it emerges from the earth, it begins to use solar energy. When the sprout was underground, it only used the resource of seed and earth.