1. After water absorption, the seed expands in volume and the seed coat bursts. ?

2. The radicle first elongates, breaks through the seed coat and develops into a young root.

3. The hypocotyl under the cotyledons was elongated, and two cotyledons protruded from the soil surface.

4. Cotyledons are separated, and the yellow-white germ gradually turns green under light and develops into stems and leaves.

Extended data:

Germination temperature

The seeds of soybean and mung bean belong to vegetable crops that like temperature and heat. The lowest temperature when their bean seeds germinate is 10℃, the optimum temperature is 2 1 ~ 27℃, and the highest temperature is 28 ~ 30℃, which should not exceed 32℃. In the process of bud culture, water is used to adjust the temperature. For example, if the temperature is too high in summer, bean sprouts should be watered thoroughly with cold water. A small amount of bean sprouts are planted in the family. In winter, the cultivation container can be placed next to the stove to keep the stove warm.

Baidu encyclopedia: mung bean sprouts