A contraceptive comparison gives typical-use pregnancies per 100 users in one year: method A, a daily hormonal pill, 8; method B, an implant, 1. Neither method protects against sexually transmitted infections.
.1
Calculate the difference in expected pregnancies between 500 users of A and 500 users of B for one year.
[2 marks]
.2
A person often forgets daily medication and also wants infection protection. Evaluate these methods for that person.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
After rainfall, water enters soil and is taken up by trees. On a sunny day the air above the woodland contains more water vapour.
.1
Explain how water moves from the soil to the atmosphere through the trees.
[2 marks]
.2
Describe two later processes that return this water to land as part of the cycle.
[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.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
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]
5 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A flask of yeast and glucose releases 18 cm³ carbon dioxide in 6 minutes at 30 °C and 3 cm³ in 6 minutes at 60 °C. A student says yeast respires fastest at any higher temperature.
.1
Calculate the ratio of the rate at 30 °C to the rate at 60 °C, expressed as a number of times.
