What rays, electromagnetic waves or radiation are harmful to plants? Such as x-rays, ultraviolet rays and so on.

I think electromagnetic waves from ultraviolet rays to higher frequencies are harmful to people. For example, ultraviolet rays can't kill bacteria that are more vital than cells and have no lethality. After ultraviolet rays, X-rays (soft/hard) have strong penetrating power and higher lethality, so the hospital does not recommend that you often do X-ray transmission CT. More powerful than X-rays is gamma rays, which easily break chemical bonds.

"Variation" is only a minor injury, and serious injury will lead to death. Variation is the result of DNA changes. DNA is a super macromolecular chain. When a beam of light just passes through the DNA molecular chain, it may change the nature of one of the base pairs, which may cause variation in the next generation. If the DNA chain is interrupted by radiation, it will lead to the synthesis of enzymes related to cell survival or the function of protein will disappear, and cells will starve to death. A large number of cells will lead to organ failure and death, and the result of a large number of organ deaths is the death of life.