Plant growth depends on photosynthesis, which depends on inputs of energy from the sun.
Based on what you have learned about plant growth, propose two mechanisms to explain how seedlings germinated in the dark are taller than seedlings germinated in the light. Predict what some of this mutants plant's phenotypic traits might be. A plant is turned horizontally and placed in a sealed box with controlled illumination from below. Based on what you know about the action of auxins in growth responses, predict how the stem might grow.