In the late 1870s,Charles Darwin and his son Francis discovered that if the tip of the grass was covered,phototropism did not occur,even though the rest of the grass was exposed to light.However,if the rest of the plant was covered and only the tip exposed to light,the grass bent a few centimeters below the tip.Which of the following was sensing the light?

Question

Quizplus · Accepted Answer

The experiment showed that when the tip of the grass was exposed to light, phototropism occurred, indicating that the sensing of light was happening in the tip. This was further confirmed when covering the tip prevented phototropism. Therefore, the auxin-producing cells in the tip of the grass were most likely sensing the light.

In the Late 1870s,Charles Darwin and His Son Francis Discovered