Invite each group to present their investigation ideas orally. Let each group exchange its proposal with another team. Invite students to change their proposal if they see a way to improve their study. You may want to combine ideas from several teams. Once the class has chosen proposals to investigate, students should build the traps with the appropriate materials and place them in locations that best test their predictions.
Check traps once or twice a week.
Collect seeds in plastic bags and label the location and date. The traps should remain in place for at least three weeks. To find out, students should predict which seeds will grow and which will not, then place each seed in a plastic bag with a dampened paper towel to germinate. Record findings and discuss expected results and surprises. Afterwards, students can design a new seed trap to improve the results of their study.