Repetition Definition. Repetition is a literary device that repeats the same words or phrases a few times to make an idea clearer. There are several types of repetitions commonly used in both prose and poetry.
Chlorophyll looks green to us because most of the green wavelengths are reflected rather than being absorbed. For this reason, green light is not an effective color of light to power photosynthesis. Chlorophyll a and b together absorb light most effectively in the blue to violet range and the orange to red range.
Type. Light consists of several colors, but plants do not need all of the colors. Red and blue are the most important colors required by plants for energy. Of the two, red light is more important. Plants that receive natural light through windows or by growing outdoors receive the proper balance of red and blue light.