The scientific experiment of color-changing flowers is that plants drink water through roots, and stems play the role of transporting water and nutrients. The stems of plants transport water and nutrients absorbed by roots to all parts of plants from bottom to top. Although the carnation in the experiment has no roots, it can still transport water from the cup to the stem, and then the water flows up the flower stem into the petals.

In this process, the color dissolved in water flows to the petals with the water, and the petals become different colors. It is precisely because the flower stems deliver different colors of water to them that you will see different colors of petals. The materials that can be prepared in the experiment are white carnations, various colors of liquid food pigments, transparent glasses, scissors and water.

Experimental flow:

1. Cut the stem of the carnation to make it fit the glass. Pour tap water into each cup, then add 10- 15 drops of food pigment into the water in each cup and stir well. Then put at least one carnation in each cup of colored water.

Check the flowers every few hours to see if there is any change. After about 6 hours, the flowers began to change: some flowers had pale colored stripes on their petals.

3. The next morning, most petals are brighter and more colorful.

4. In the next few days, the color of petals kept changing, but the color was not completely saturated. I wonder if this has anything to do with the amount of food pigment added.

Pay attention to the experiment. You can observe whether the color change of petals is affected by changing the amount of food pigment, or put the same colored water into different varieties of flowers to observe whether the color change is the same. At the same time, choose white flowers, cut the bottom of the rhizome obliquely or longitudinally from the middle, and finally use food pigment as colored water. If there is no food pigment, you can also use ink.