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]AQA GCSE Combined Science June 2024 Biology Paper 2F
5 questions on this paper's topics
25:001 of 5
A student measured his reaction time. His partner held a ruler with the 0 cm mark level with the top of the student's thumb, then dropped it without warning. The student caught it as quickly as possible, and the partner read the distance fallen.
| Distance fallen (cm) | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|
| Reaction time (s) | 0.143 | 0.150 | 0.156 | 0.163 | 0.169 | 0.175 |
.1
In five trials the ruler fell 15 cm, 12 cm, 14 cm, 11 cm and 13 cm.
Calculate the mean distance.
[2 marks].2
Use the conversion table to give the student's mean reaction time.
[1 mark].3
Give two variables the student should control to make his results valid.
[2 marks]Some strains of bacteria are resistant to antibiotics. MRSA is resistant to several antibiotics.
.1
Explain how a population of bacteria becomes resistant to an antibiotic.
[4 marks].2
Give two ways to reduce the rate at which antibiotic-resistant strains develop.
[2 marks]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.
| 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]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]