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.
The two important photobiological processes in trees and their required color wavelengths are: 1  Photosynthesis - requires visible blue (400-450 nm) and red (625-700 nm) - uses light to make sugars that the tree uses.