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.
Without plants giving off oxygen as a waste, we couldn't break down food to make the high-energy molecules (ATP) that keep our bodies alive. One good clue about whether something does photosynthesis is color. If a living thing is green or blue-green it probably does photosynthesis.