A transect runs from a shaded wall into a lawn. Mean plant counts per quadrat at 0, 2, 4, 6 and 8 m are 1, 3, 6, 6 and 5 respectively.
.1
Describe the pattern in the data without claiming a cause.
[2 marks]
.2
Explain how to investigate whether light accounts for the pattern.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Oxygen volumes collected from pondweed in three 5-minute repeats are 4.5, 5.0 and 5.5 cm³. A second student counts bubbles instead of collecting gas.
.1
Calculate the mean oxygen production rate.
[2 marks]
.2
Evaluate counting bubbles compared with collecting gas volume.
[2 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Root cells absorb nitrate from a solution with a lower nitrate concentration than the cells. A poison stops respiration without damaging the cell membrane.
.1
Explain why nitrate uptake decreases.
[3 marks]
.2
Explain why water can still cross the membrane.
[2 marks]
4 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
After ovulation, progesterone rises. Later in a cycle with no pregnancy, progesterone falls.
.1
Explain the effect of progesterone while its concentration is high.
[2 marks]
.2
Explain what follows the fall in progesterone.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A person with Type 1 diabetes says that insulin lowers blood glucose because it destroys glucose molecules in the bloodstream.
.1
Explain why this explanation is incorrect.
[2 marks]
.2
Explain why a person with Type 1 diabetes may need insulin treatment even when they avoid sugary foods.
