AQA ease wnte e y In Centre number Surname Forename(s) Candidate signature capta s. Candidate number I declare this is my own work. GCSE BIOLOGY Paper 2H Higher Tier

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Materials For this paper you must have: • a ruler • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in ... the boxes at the top of this page. • Answer all questions in the spaces provided. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. • In all calculations, show clearly how you work out your answer. Information • The maximum mark for this paper is 100. • The marks for questions are shown in brackets. • You are expected to use a calculator where appropriate. • You are reminded of the need for good English and clear presentation in your answers. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE BIOLOGY Higher Tier Paper 2H H 2 *02* IB/M/Jun22/8461/2H Do not write outside the There are no questions printed on this page box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED 3 *03* Turn over ► IB/M/Jun22/8461/2H Do not write outside the box 0 1 There are two types of reproduction: • sexual reproduction • asexual reproduction. 0 1 . 1 Complete Table 1 to compare sexual reproduction with asexual reproduction. Write a tick ( ) in the box if the statement is true. The first row has been completed for you. [2 marks] Table 1 Sexual reproduction Asexual reproduction Cell division occurs Fertilisation occurs Genes are passed on from parent to offspring Offspring are genetically identical to each other 0 1 . 2 Gametes are formed in sexual reproduction. Name the male gamete formed in flowering plants. [1 mark] Question 1 continues on the next page Answer all questions in the spaces provided. 4 *04* IB/M/Jun22/8461/2H Do not write outside the Cell division by meiosis forms gametes. box Figure 1 shows the mean mass of DNA per cell before, during and after meiosis. Figure 1 Use information from Figure 1 to answer questions 01.3 to 01.6. 0 1 . 3 When is the DNA in the chromosomes being copied? [1 mark] Tick () one box. Between 0 and 3 hours Between 3 and 4 hours Between 4 and 5 hours Between 5 and 6 hours 5 *05* Turn over ► IB/M/Jun22/8461/2H Do not write outside the box 0 1 . 4 Cells divide twice during meiosis. Which two times in Figure 1 show one cell dividing into two cells? [2 marks] Tick () two boxes. 3 hours 4 hours 5 hours 6 hours 8 hours 0 1 . 5 What is the mean mass of DNA in arbitrary units in a sperm cell? [1 mark] Tick () one box. 2 4 8 16 0 1 . 6 What is the mean mass of DNA in arbitrary units in each cell in an embryo? [1 mark] Tick () one box. 2 4 8 16 Turn over for the next question 8 6 *06* IB/M/Jun22/8461/2H Do not write outside the 0 2 Earthworms: box • live in soil • feed on dead and decaying plant matter • have soft, moist skin • exchange gases through their skin. 0 2 . 1 Give two abiotic factors and two biotic factors that could affect the size of an earthworm population. [4 marks] Abiotic factors 1 2 Biotic factors 1 2 7 *07* Turn over ► IB/M/Jun22/8461/2H Do not write outside the box 0 2 . 2 Students investigated the populations of earthworms in the soil in two different areas: • Area A: a grass lawn • Area B: a farmer’s field. Chemical X can be mixed with water and poured onto the soil. The mixture brings earthworms to the surface of the soil but does not harm the earthworms. Plan an investigation using chemical X to compare the number of earthworms per m2 in areas A and B. [6 marks] Turn over for the next question 10 8 *08* IB/M/Jun22/8461/2H Do not write outside the 0 3 It is important to control the concentration of glucose in the blood. box Figure 2 shows how the concentration of glucose in the blood of a person changed over 4 hours. Figure 2 0 3 . 1 Give one time when the concentration of insulin in the person’s blood would be high. Use Figure 2. [1 mark] Time = hours 9 *09* Turn over ► IB/M/Jun22/8461/2H Do not write outside the box 0 3 . 2 Explain the effect a high concentration of insulin has on blood glucose concentration. [3 marks] Effect Explanation Question 3 continues on the next page 10 *10* IB/M/Jun22/8461/2H Do not write outside the People with diabetes have difficulty controlling the concentration of glucose in box their blood. Type 2 diabetes is linked to obesity. Figure 3 shows how to find if an adult’s body mass is healthy for their height. Figure 3 11 *11* Turn over ► IB/M/Jun22/8461/2H Do not write outside the box 0 3 . 3 Person A: • is 1.75 m in height • has a body mass of 52 kg. What is person A’s weight category? [1 mark] Tick () one box. Underweight Healthy weight Overweight Obese 0 3 . 4 Person B is 1.9 m in height. Give the range of body masses that would put person B in the healthy weight category. [1 mark] Range from kg to kg Question 3 continues on the next page 12 *12* IB/M/Jun22/8461/2H Do not write outside the 0 3 box . 5 Person C is obese. A doctor thinks that person C has Type 2 diabetes. The doctor tests a sample of blood from person C. Table 2 shows: • the results of the blood test • the mean results for people who do not have diabetes. Table 2 Concentration in blood Person C Mean for people who do not have diabetes Cholesterol in mmol/dm3 6.21 5.20 Glucose in mmol/dm3 9.56 4.51 Insulin in arbitrary units 24.32 14.83 Type 2 diabetes occurs when body cells have a reduced response to insulin. Give two ways the results of the blood test show that person C might have Type 2 diabetes. [Show More]

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