The seeds of certain plants usually do not germinate until they have remained in the soil for several months. Seeds were taken from a plant of this kind. Some students wanted to investigate whether a chemical in the testa was stopping germination. The seeds were split into three groups, as outlined. Only the seeds in group 2 germinated. What would be the most sensible next step in this experiment?
- Achange the water of the seeds in group 3 every day to see if they germinate
- Bchange the apparatus so that oxygen cannot reach the seeds
- Crepeat the experiment at several different temperatures
- Drepeat the experiment using different species of seed