Differentiation Modifications You can increase or decrease the level of complexity of the math problems students need to do here in order to calculate initial dry mass. For instance, students can calculate the mass of a single radish seed or calculate the dry mass per unit volume of nutrients in the nutrient solution. Extending the Learning Have students make regular observations of their seeds as they grow over the next 2-3 weeks. These observations can be recorded in Pre-Lesson 0.2PT Plant Growth Investigation Setup Worksheet.