Four plants all have genotype RR at one tested gene, but their final heights are 14, 19, 24 and 27 cm. The plants grew with different supplies of water. A student claims that these results show height cannot be inherited.
.1
Explain why the student’s conclusion is not justified.
[3 marks]
.2
Suggest how to test the effect of water while reducing genetic differences between plants.
[2 marks]
6 marksFoundation and HigherRequired practical 064.5.2 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
Students want to test whether doing mental arithmetic changes ruler-drop reaction time. They will use a safe classroom investigation with volunteers. You may compare drop distances directly: longer distances indicate slower reactions.
Plan the investigation so that the results can support a valid comparison.
[6 marks]
6 marksHigher4.6.4 Classification of living organisms
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.6.4
Original practice question
Answer and supported method checks
A proposed classification puts a whale with fish because both have a streamlined body. A second classification puts it with mammals using inherited features and DNA evidence.
Evaluate which evidence provides the stronger basis for an evolutionary classification.
[6 marks]
4 marksHigher4.5.3.3 Hormones in human reproduction4.5.3.4 Contraception
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.5.3.3
Spec 4.5.3.4
Original practice question
Answer and supported method checks
A model of hormonal contraception keeps oestrogen and progesterone at concentrations that inhibit FSH and LH.
.1
Explain how this model reduces the chance of pregnancy.
[3 marks]
.2
Explain why this hormone model does not predict protection from sexually transmitted pathogens.
