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 weigh the radish seed, discover it weighs less than 0.01 grams, and record that as the mass, as it is essentially negligible. Or, students could weigh multiple radish seeds and calculate the average mass for each seed (recommended). Similar types of math problems could be done with the gel and nutrient mixture. Extending the Learning Have students make regular observations of their seeds as they grow over the next 3-4 weeks.