4 marksFoundation and HigherRequired practical 074.7.2.1 Levels of organisation
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.2.1
Original practice question
Answer and supported method checks
A transect runs from a shaded wall into a lawn. Mean plant counts per quadrat at 0, 2, 4, 6 and 8 m are 1, 3, 6, 6 and 5 respectively.
.1
Describe the pattern in the data without claiming a cause.
[2 marks]
.2
Explain how to investigate whether light accounts for the pattern.
[2 marks]
4 marksFoundation and Higher4.5.3.2 Control of blood glucose concentration
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.5.3.2
Original practice question
Answer and supported method checks
A person with Type 1 diabetes says that insulin lowers blood glucose because it destroys glucose molecules in the bloodstream.
.1
Explain why this explanation is incorrect.
[2 marks]
.2
Explain why a person with Type 1 diabetes may need insulin treatment even when they avoid sugary foods.
[2 marks]
4 marksFoundation and Higher4.5.2 The human nervous system
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.5.2
Original practice question
Answer and supported method checks
Two neurones meet at a synapse. An electrical impulse reaches the end of the first neurone.
.1
Describe how information passes to the second neurone.
[3 marks]
.2
A substance stops release of the chemical. Predict the effect on transmission at this synapse and explain your answer.
[1 mark]
4 marksHigher4.7.1.2 Abiotic factors
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.1.2
Original practice question
Answer and supported method checks
Researchers record 48 freshwater invertebrate species at an unpolluted site and 18 at a site with low dissolved oxygen. The sites also differ in temperature and water flow.
.1
Calculate the percentage decrease in species count relative to the unpolluted site.
[2 marks]
.2
Evaluate the claim that low oxygen alone caused the decrease.
[2 marks]
4 marksHigher4.6.2.4 Genetic engineering
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.6.2.4
Original practice question
Answer and supported method checks
An engineer wants all cells of a new plant to contain an introduced gene. Another proposal would insert the gene into just a few cells of a fully grown leaf.
.1
Explain why introducing the gene at an early developmental stage is more suitable for the first aim.
[2 marks]
.2
Explain a limitation of inserting the gene only into a mature leaf.
