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.
Photosynthesis begins with light absorption. Chlorophyll absorbs all colors of light except for green -- plants appear green because chlorophyll reflects back the green wavelengths that strike it. This light energizes electrons inside the chlorophyll, giving the plant energy to power sugar synthesis.