In order to find the "eyes" of plants, biologist Darwin designed a sophisticated biological experiment and found the answer.
Darwin placed canary grass in a completely dark room for several days. Then, they lit a small kerosene lamp 12 feet from the pot. The light was dim, but after only 3 hours, the canary grass obviously bent towards the dim light. This shows that the canary grass does see the light. And canary grass always bends 1 inch below the tip of the stem. Does the canary grass's "eyes" grow on the tip of the stem?
In order to verify this expectation, Darwin then conducted the following experiment: he found 5 similar canary grass seedlings. The first plant did not do any treatment. The second plant cut off the stem tip. The third plant covered the stem tip with an opaque hat, the fourth plant replaced with a transparent glass hat covering the stem tip, and the fifth plant covered the lower part of the canary grass with an opaque tube. The five samples were placed in a dark room with lights and the results came out 3 hours later.
Untreated seedlings are naturally bent towards the light. Similarly, seedlings with translucent glass hats at the tip of the stem or with opaque tubes at the lower part also bent towards the light. Only by removing the seedlings at the tip of the stem, or by covering the tip of the stem with an opaque cap, which remains upright, indicates that they are "blind".
This experiment confirms that the "eyes" of canary grass are on its stem tip. Darwin used other plants to test the same results. Therefore, in a simple scientific experimental report published in 1880, Darwin pointed out that plant growth is light-oriented, and the light-sensitive part of the plant is at its seedling tips. When the seedling tips see light, it transmits information to the middle of the plant, making it bend in the direction of light.
In fact, plant phototropism is a very common phenomenon, and modern science has finally figured out the principle. The buds of plants will make auxin and transport it downwards. Light will affect the distribution of auxin. There is less growth hormone distribution on the side toward the light. cells grow slowly. There is more growth hormone distribution on the side toward the backlight, and the cells grow fast, making the plants always curve toward the side with light. This is also the reason why sunflower always rotates towards light.
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