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 marksHigher4.5.3.3 Hormones in human reproduction
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.5.3.3
Original practice question
Answer and supported method checks
After ovulation, progesterone rises. Later in a cycle with no pregnancy, progesterone falls.
.1
Explain the effect of progesterone while its concentration is high.
[2 marks]
.2
Explain what follows the fall in progesterone.
[2 marks]
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 marksHigher4.7.3.6 Maintaining biodiversity
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.3.6
Original practice question
Answer and supported method checks
A conservation programme breeds an endangered animal in captivity. The original release habitat is still being cleared, and the captive population descends from few parents.
.1
Explain why breeding alone may not establish a stable wild population.
[2 marks]
.2
Suggest two complementary actions and explain their purposes.
[2 marks]
4 marksFoundation and Higher4.7.3.4 Deforestation
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.3.4
Original practice question
Answer and supported method checks
Forest is cleared to grow crops used as livestock feed. Cut trees are burned.
.1
Explain two different mechanisms by which this can increase atmospheric carbon dioxide.
[2 marks]
.2
Explain why biodiversity can decline even if a crop rapidly covers the cleared ground.
