Chemical components in soybean growth process

Once I started the experiment of "Soybean Growth Process".

I'll prepare transparent plastic cups, dirt, paper towels and soybean seeds first. Then spread paper towels around the cup and put more than half of the soil in the cup. Then, I put some seeds between the cup and the tissue. Finally, I crushed a small part of the remaining mud and put it in a cup (the seeds are about one centimeter deep from the surface), and poured some water to make the paper towel completely wet. So the seeds were planted.

A few days later. I came to the windowsill to observe the seeds. I found the color of the seeds changed a little. Originally, the color of the seed was big yellow, but after these days, the appearance of the seed was a little light and it felt a little transparent. The seeds are particularly full and the seed coat is a little cracked.

Two days have passed. I went to the windowsill again to observe the seeds. I looked into the cup. To my surprise, the seeds germinated. The shell of the seed cracked. Buds are drilled from the inside, and the color of buds is light yellow with a little cyan. The top of the bud is pointed and looks very tender. This is the bud head. The bud head grows downward. There is a question in my mind: why does the bud of a seed grow down? Isn't this impossible to drill out? I thought about it and watered it.

The next day, I came to the window platform again to observe the seeds. Through my observation. Seeds change greatly now and when they germinate. When it germinated, the seed shell just broke, and now most of it has fallen off. I really want to help it peel off all the shells. The real small leaf bud in the seed has left its original position and is close to the outside. Two trees emerged from the soil. Originally it was closed, but now it is scattered, with a small bud in the middle. I also found that each bud has two leaves, which look furry like a love shape.

A few days later, I came to the windowsill again. There were many small green bean sprouts in the cup. I also found that its leaves are two opposite pieces.

Now we know why the new bud of this seed grows downward. That's because it's not a bud, but a root, so it should grow down.

When I came to the windowsill again to observe, the soybean had changed from a seed to a bean sprout, and then it grew up slowly ... Now a soybean seedling is wrapped around the safety window to help it grow. This soybean seedling is also the fastest growing one.

Although growing soybeans is small, it is a good start for me to experience plant growth.