Two conservation sites report these survey results after five years: site A has 1000 individuals from 4 species; site B has 600 individuals from 18 species. Survey methods and sampled area are the same.
.1
Evaluate the statement that A has greater biodiversity because it has more individuals.
[2 marks]
.2
Suggest why before-and-after evidence is needed to judge which conservation programme improved biodiversity more.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A virus damages immune cells. Patients later get frequent infections from other pathogens. Long illness prevents some patients from working or meeting friends.
.1
Explain why other infections become more frequent.
[2 marks]
.2
Suggest two links between long illness and poorer mental health.
[2 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
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 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]
4 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
Equal masses of fat are mixed with equal lipase concentrations at 37 °C. A has large droplets at pH 3; B has large droplets at pH 8; C has small droplets at pH 8. This lipase works best near pH 8.
.1
Explain why B should digest fat faster than A.
[2 marks]
.2
Explain why C should be faster than B and relate this to bile.
