Electromagnetic spectrum helps the plants grow because of the waves of light. Plants need the light to grow so without electromagnetic spectrum there would be no food for animals and when the animals that eat the grass they will starve and die, then the animals that eat other animals will starve and die also.
Electromagnetic spectrum is the frequency of light starting at red and going to purple red is inferred and purple is ultraviolent. Electromagnetic spectrum extends from modern radio stations to gamma radiation.
ELECTROMAGNETIC SPECTRUM AND HOW IS IT RELATED TO PLANTS?
Electromagnetic spectrum is a series of wave lengths. They are as small as atoms. Gamma waves are half the size of atoms. Whereas wavelengths can be as long as the universe. Photon energy is directly proportional to the frequency. Electromagnetic spectrum is related to plants because plants are the only things in the world that can absorbe it.