5 marksFoundationRequired 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 student estimated the number of daisies in a field 50 m long and 40 m wide. She placed a 0.25 m² quadrat at five random positions and counted the daisies in each.
Daisies in five quadrats: 4, 7, 0, 5, 9.
Quadrat
1
2
3
4
5
Number of daisies
4
7
0
5
9
.1
Calculate the mean number of daisies per quadrat.
[2 marks]
.2
Estimate the number of daisies in the whole field.
[3 marks]
4 marksFoundation and Higher4.5.3.2 Control of blood glucose concentration
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.5.3.2
Original practice question
Answer and supported method checks
After a meal containing carbohydrates, the concentration of glucose in the blood rises.
.1
Explain how the body returns the blood glucose concentration to normal after the meal.
[3 marks]
.2
What is the cause of type 1 diabetes?
[1 mark]
3 marksFoundation and Higher4.6.1.6 Sex determination
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.6.1.6
Original practice question
Answer and supported method checks
A couple already have three daughters. They are expecting a fourth child.
.1
Give the probability that the fourth child will be a boy.
[1 mark]
.2
Explain why the chance of any baby being a boy is 50%.
[2 marks]
3 marksFoundation and Higher4.6.4 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
In 1990, Carl Woese proposed a three-domain system of classification.
.1
What are the three domains?
[1 mark]
.2
Explain why scientists changed from Linnaeus's system to the three-domain system.
[2 marks]
3 marksFoundation and Higher4.7.3.3 Land use
AQA Trilogy 8464
Spec and skills
Paper scope: B2
Spec 4.7.3.3
Original practice question
Answer and supported method checks
Peat bogs are areas of partly decayed plant material that has built up over thousands of years. Peat is dug up to make garden compost.
.1
Explain why destroying peat bogs increases the amount of carbon dioxide in the atmosphere.
[2 marks]
.2
Give one other reason why destroying peat bogs is harmful.
