Suppose that a plant is a short day plant. Red light has a wavelength of 660 nm. Canavanine is an unusual amino acid made by some plants. Since canavanine resembles argenine, it is incorporated into the herbivore's protein structure. Auxins cause acidification of cell walls that results in immediate elongation.
Auxins also cause sustained long-term cell elongation involving protein synthesis.
Visualize the following scenario. Indicate both the direction AND the degree of curvature that you would expect to see in the two coleoptile stumps. It dies 22.