Explain why it is important to keep body temperature close to 37 °C.
[2 marks]
.2
Which of these is an effector?
[1 mark]
.3
Name the coordination centre that receives information from temperature receptors.
[1 mark]
4 marksFoundation and Higher
Spec and skills
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]
5 marksFoundation
Spec and skills
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]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Heart muscle contracts all the time, throughout life.
.1
Explain why heart muscle cells contain many mitochondria.
[2 marks]
.2
Compare aerobic respiration with anaerobic respiration in muscle cells.
[3 marks]
3 marksFoundation
Spec and skills
Original practice question
Answer and supported method checks
A student put some pondweed in a beaker of water under a lamp. She collected the oxygen given off in an upturned 25 cm³ measuring cylinder that was full of water at the start.
The measuring cylinder's scale starts at 0 cm³ at its closed end, which is now at the top. As oxygen collects at the top, it pushes the water down.
After 10 minutes, the boundary between the oxygen and the water was at the 4.0 cm³ mark.
.1
What volume of oxygen did the student collect?
[1 mark]
.2
Calculate the rate of oxygen production in cm³ per minute.
[1 mark]
.3
Another student counted the bubbles of oxygen instead.
Suggest why measuring the volume of gas gives more accurate results than counting bubbles.
