As we all know, plants can't live without soil, water and sunlight. So do plants really have hydrotropism? Examples in science books prove that after a small tree died, the roots on one side of the pond were very dense. This case proves that plants have hydrotropism. I also wanted to do this experiment, so I found a dying sapling in the community. I put a pot of water on one side of the root. After a few days, the roots of the saplings really reached into the water.

I did another experiment according to the method in the science book. I found some sprouted bean sprouts, shallow plates, napkins and a glass of water. First of all, I put the bean sprouts on the napkin in a shallow pot in the same direction. One end of the napkin is in contact with the tampon, and the other end of the tampon is immersed in water. In this way, the water near one end of the sliver is richer than that at the other end. I will observe the growth direction of bean seedlings in the next few days, and then change the position of cotton sliver in a few days to continue to observe the growth direction of bean seedlings. After observation, I found that when the cotton sliver is on the left, the bean sprouts grow on the left, and when the cotton sliver is on the right, the bean sprouts grow on the right. The growth of bean seedlings can be changed because of the position of cotton sliver, and the direction of cotton sliver is the direction with sufficient water.

In this way, in my experiment on the growth direction of bean seedlings, the results fully and forcefully proved that plants have hydrotropism.