GCSE Grade

1 GCSEAQA - Triple ScienceGradeMaterialsFor this paper you must have:RulerPencil and RubberScientific calculator, which you are expected to use when appropriateInstructionsAnswer all questionsAnswer questions in the space providedAll working must be shownInformationThe marks for the questions are shown in bracketsName:BIOLOGYMarkDate:B5 - Test students investigated geotropism in the roots of bean 1 shows the apparatus is the method Measure the length of the root of each of 10 bean Pin 5 seedlings to the cork mat in apparatus Pin 5 seedlings to the cork mat in apparatus Leave A and B in a dark cupboard for 2 After the 2 days: make a drawing to show the appearance of each seedling measure the length of the root of each 1 of (a) Why did the students surround the seedlings with damp blotting paper?

2 Tick one box. To prevent light affecting the direction of root growthTo prevent photosynthesis taking place in the rootsTo prevent the growth of mould on the rootsTo prevent water affecting the direction of root growth(1)Apparatus B is a B rotates slowly.(b) How does apparatus B act as a control?_____(1)Page 2 of table below shows the students results. Apparatus AApparatus BSeedlingnumber1234512345 Length atstart inmm35413233393033292831 Lengthafter 2days inmm49574345544545442944 Lengthchange inmm1416111215151215113 Meanlengthchange inmm1411(c) One student stated: The mean length change for the seedlings in apparatus B is not valid.

3 Suggest the reason for the student s (1)(d) Suggest one improvement the students could make to obtain a more valid mean lengthchange for the seedlings in apparatus (1)Page 3 of (e) Figure 2 shows the students drawings of two seedlings at the end of the 2 2 A plant hormone is made in the root hormone diffuses from the tip into the tissues of the how the hormone causes the appearance of the seedlings in Figure 2 to should refer to both seedlings in your (3)Page 4 of (f) In horticulture plant hormones are used for controlling plant one line from each plant hormone to the correct use of that hormone.

4 Plant hormone Use of hormone To reduce the time takenfor tomatoes to ripenAuxin To slow down the growthof plant stemsEthene To promote seedgerminationGibberellin To stimulate root growthin plan cuttings(3)(Total 10 marks)Many functions of the human body are controlled by chemicals called hormones.(a) What is a hormone?_____(3)2.(b) Name the two hormones that control blood glucose and _____(1)Page 5 of graph shows changes in the concentration of glucose in the blood of a healthy personfollowing a meal. (c) Explain how negative feedback controls the blood glucose concentration during the firstone and a half hours after the (4)(Total 8 marks)Page 6 of 1 shows a reflex in the iris of the human eye in response to changes in light 1 @ Gandee Vasan/Stone/Getty Images(a) Describe the changes in the pupil and iris going from A to B in Figure how these changes to the changes in light level in your (4) 7 of (b)

5 Some people wear glasses to improve their 2 shows light entering the eye in a person with blurred 3 shows how this condition is corrected with glasses. Figure 2 Figure 3 Compare Figure 2 and Figure how the blurred vision is (2)(Total 6 marks)Page 8 of controls the internal conditions of the body.(a) Explain how blood glucose levels are controlled in the body of someone who does nothave (4)4.(b) Compare how each type of diabetes is how each type of diabetes can be (4)Page 9 of (c) Look at the table below.

6 Population of UK in 107 Number of people diagnosed with 106 Estimated number of people with undiagnosed 105 Calculate the percentage (%) of the UK population estimated to have should include both diagnosed and undiagnosed people in your your answer to 2 significant percentage of population with diabetes = ___ %(3)(d) A urine test can be used to check for the presence of glucose in the can also be diagnosed with a blood test to measure the concentration of why a blood test is more reliable than a urine (1)(e) A blood test called the glucose tolerance test checks how well the body processes of glucose in the blood are measured before and after drinking a are not allowed to eat food for 8 hours before the glucose tolerance why patients are not allowed to eat for 8 hours before the (1)Page 10 of (f) The diagram below shows the results of a glucose tolerance test for two patients, A and B.

7 Which patient has diabetes?Justify your _____Justification _____(2)(Total 15 marks)Page 11 of diagram shows the structures involved in the knee-jerk reflex. When the person is hit at pointP, the lower leg is suddenly raised. (a) Name the structures labelled A, B and _____B _____C _____(3)5.(b) How is information passed across a synapse?_____(1)(c) What is the effector in this response?_____(1)(Total 5 marks)(a) Each day, a boy ate food containing 12 000 kilojoules of energy. The boy s body used80 per cent of this energy to maintain his core temperature.

8 (i) Name the process which releases energy from (1) 12 of (ii) Calculate the amount of energy that the boy would use each day to maintain his corebody temperature. Show clearly how you work out your final of energy used each day = _____ kJ(2)(b) The diagram shows a section through human skin. Explain how structure A helps to cool the body on a hot (3)(c) Body temperature is monitored and controlled by the thermoregulatory centre. Where in thebody is the thermoregulatory centre?_____(1)(Total 7 marks)People with type 1 diabetes inject insulin to control their blood glucose pancreas transplant is another treatment for type 1 risk of a pancreas transplant is organ 13 of (a) Explain why a transplanted organ may be (3)(b) Scientists have developed an artificial pancreas to treat type 1 diagram below shows how an artificial pancreas works.

9 Page 14 of (i) A woman with type 1 diabetes has an artificial pancreas. The woman eats a mealhigh in sugar. The meal causes her blood glucose level to information from the diagram above to describe what happens to bring the bloodglucose level of the woman back to (4)(ii) The traditional way of monitoring and treating type 1 diabetes is to take a smallsample of blood and put it on a test strip to find out how much insulin to one possible advantage, other than not having to do blood tests, of themethod used in the diagram (1)(Total 8 marks)A woman suffers a minor infection that affects her kidneys.

10 She is sent to hospital for treatmentwith a dialysis machine. A simplified diagram of a dialysis machine is shown below. 15 of (a)Explain why the membrane is important in the dialysis (2)(b)Some of the components of the woman s blood and of the dialysis fluid entering themachine are shown in the s bloodentering machineDialysis fluidentering machineBlood cellsGlucoseUreaKey: = present = absentUse the information in the table to explain the composition of the dialysis fluid entering (4)(c)One alternative to treatment with a dialysis machine is to have a kidney why a kidney transplant might not be suitable in this woman s (2)Page 16 of 17(2)(Total 9 Marks)