Pearson Edexcel Level 1/Level 2 GCSE (9 - 1) Combined Science
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Surname
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Centre Number
Pearson Edexcel Level 1/Level 2 GCSE (9 - 1)
Candidate Number
Combined Science
Paper 2: Biology 2
Monday 11 June 2018 ? Morning Time: 1 hour 10 minutes
You must have: Calculator, ruler
Foundation Tier
Paper Reference
1SC0/2BF
Total Marks
Instructions
Use black ink or ball-point pen.
?? Fill in the boxes at the top of this page with your name, centre number and candidate number. Answer all questions.
?? Answer the questions in the spaces provided ? there may be more space than you need. Calculators may be used.
? Any diagrams may NOT be accurately drawn, unless otherwise indicated. ?? You must show all your working out with your answer clearly identified at
the end of your solution.
Information
The total mark for this paper is 60.
?? The marks for each question are shown in brackets ? ? use this as a guide as to how much time to spend on each question.
In questions marked with an asterisk (*), marks will be awarded for your ability to structure your answer logically showing how the points that you make are related or follow on from each other where appropriate.
Advice
Read each question carefully before you start to answer it.
? Try to answer every question. ?? Check your answers if you have time at the end.
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P59180A
?2018 Pearson Education Ltd.
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Answer ALL questions. Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then
mark your new answer with a cross .
1 Insulin is produced by an endocrine gland and is transported in the blood.
(a) (i) Which row shows the endocrine gland and the target organs for insulin? (1)
endocrine gland A adrenal B adrenal C pancreas D pancreas
target organs liver and muscles small and large intestines liver and muscles small and large intestines
(ii) Which part of the blood transports insulin to its target organs? (1)
A plasma
B red blood cells
C white blood cells
D platelets
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(b) Figure 1 shows the blood glucose and blood insulin concentration for a healthy person during one day.
Key blood glucose
blood insulin
concentration in blood
breakfast
lunch
dinner
morning
midday
evening
Figure 1
The blood glucose concentration increases after a meal.
Explain why the blood glucose concentration then decreases. (2)
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(c) State one cause of type 1 diabetes. (1)
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(d) Explain how controlling the diet can be used to treat type 2 diabetes. (2)
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(e) A scientist is planning to test a new treatment for type 2 diabetes. She selects 300 volunteers who have type 2 diabetes. State two other factors that the scientist should consider when selecting the 300 volunteers. (2)
1 ............................................................................................................................................................................................................................................................................... 2 ...............................................................................................................................................................................................................................................................................
(Total for Question 1 = 9 marks)
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2 (a) Figure 2 shows alveoli from a healthy lung.
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Figure 2 Smoking can cause a condition called emphysema. Figure 3 shows alveoli from a person with emphysema.
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Figure 3
Use words from the box to complete the following sentences. (2)
breathing osmosis
diffusion smaller
larger thicker
The alveoli from the person with emphysema have a .............................................................................. surface area than the alveoli from a healthy lung. The surface area of the alveoli will affect how much oxygen moves into the blood by the process of . ..............................................................................
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(b) The graph in Figure 4 shows the volume of oxygen an athlete absorbs at different running speeds.
5 ?
4 ?
oxygen
3 ?
absorbed
in dm3 per 2 ? minute
1 ?
? ? ? ? ? ? ? ? ?
0 ? 0 2 4 6 8 10 12 14 16 running speed in km per hour
Figure 4
(i) Describe the trend shown in Figure 4. (2)
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(ii) Which uses more oxygen when the running speed of the athlete changes from 4 to 6 km per hour? (1) A increasing aerobic respiration B increasing anaerobic respiration C decreasing aerobic respiration D decreasing anaerobic respiration
(iii) Explain why the athlete produces lactic acid when running at 14 km per hour. (2)
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(Total for Question 2 = 7 marks)
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7
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