A town offers a vaccine against a serious droplet-spread disease. Some residents cannot receive it for medical reasons. A group argues that vaccination is purely an individual choice with no effect on other people.
Evaluate the group's claim using vaccination and transmission.
[6 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A chart shows an XX egg-producing parent and an XY sperm-producing parent. A student says that the egg determines whether the child is XX or XY.
.1
Explain why the student’s statement does not follow the chromosome model.
[2 marks]
.2
Explain why an earlier XY child does not make an XX child more likely next time.
[2 marks]
6 marksFoundation and Higher
Spec and skills
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]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A shrub produces flowers visited by bees. The bees obtain nectar, and pollen is transferred between flowers. A long drought reduces the shrub population.
.1
Explain why the relationship is an example of interdependence.
[2 marks]
.2
Explain how the drought could affect the bees even if they are not directly harmed by dry air.
[2 marks]
5 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
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.
