Use a metric tape or ruler to measure the longest root growth. Keep a table of your data. After a week or so, plant the seeds in soil and let them continue their life cycle. Chart and analyze the root growth data. Conclusions You should use a variety of seeds so that students can observe the difference between monocots and dicots.
Bean seeds are good dicots.
Ordinary turfgrass seeds are good monocots, but you can try any seed variety you like. If the potted seeds grow well, consider planting the plants outside in a garden where you'll be able to track the plant's continuing life cycle.