Students apply the science of chemistry to soil and plant relationships. They define diffusion and indicate for which of these nutrient(s) would you expect diffusion to be the most important for movement to the plant root? Pupils answer the following questions: For which of these nutrient(s) is diffusion the least important and how does this nutrient move to the plant root?, and Indicate three factors that influence the rate at which ions diffuse and riefly explain why.