The diagram below shows a food web containing stevia plants.
Write down the number of trophic levels in this food web.
State the primary source of energy for this food web.
Septoria fungus is a parasite of the stevia plant. Explain what is meant by the term parasite.
Stevia is grown commercially as a sweetener crop. Farmers often introduce parasitoid wasps to their crop fields.
Explain why farmers do this, using the food web diagram to support your answer.
Stevia contains steviol glycosides, which make the leaves taste extremely sweet but are not sugars.
Describe how a student could test a sample of stevia leaf extract to show that it does not contain reducing sugars.
Reagent used:
Method:
Expected result:
Explain how using stevia extract instead of sugar in food products benefits people with type 2 diabetes.