Factors that affect germination
Science presenter Jon Chase investigates the effect of temperature, water and oxygen on seed germination. He finds out that seeds germinate best in warm, moist and well oxygenated conditions. Finally, Jon looks at the effect fertiliser has on the rate of germination and plant growth.
Students could repeat the experiment seen in the clip using cress seeds. Do the students’ results reflect the findings of the clip? Are temperature, water and oxygen the key factors? The scientist interviewed says that water is most important of the three. The scientist also says that fertilisers (nitrates) speed up germination (as well as plant growth). Does this match with your students’ findings? Students could then look at the fertilisation of plants, by placing pollen onto a stigma and observing it grow into a pollen tube.