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Download Actual 2025 AQA GCSE BIOLOGY 8461/2H Paper 2 Higher Tier Question Paper + Mark Scheme Act and more Exams Biology in PDF only on Docsity!
Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature | declare this is my own work. GCSE BIOLOGY Higher Tier Paper 2H Monday 9 June 2025 Morning Time allowed: 1 hour 45 minutes 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. For Examiner's Use Question Mark e|/N) oalal}ajo|rn|a TOTAL 612H01 UN25 84 1B/G/Jun25/G4006/E9 8461/2H 1 Do not write outside the Answer all questions in the spaces provided. box Ichthyosaurs are reptiles that lived in the sea millions of years ago. Figure 1 shows the fossilised remains of an ichthyosaur. Figure 1 [o[4|.[4] Suggest how the fossil in Figure 1 was formed after the ichthyosaur died. [2 marks] [0[1].[2] The length of the image of the ichthyosaur in Figure 1 is 120 mm. The real length of the ichthyosaur was 17 times longer than the image in Figure 1. Calculate the real length of the ichthyosaur. Give your answer in metres. [3 marks] Real length of ichthyosaur = metres MIN IB/G/Jun25/8461/2H 2 Students investigated how many daisy plants were growing in a field at different distances from a tree. This is the method used. 1. Place a 20-metre tape measure on the ground, with the tree at 0 metres. 2. Place a 1 m? quadrat on the ground every 4 metres along the tape measure. 3. Count the number of daisy plants in each quadrat. 4. Take a soil sample from each quadrat to find the percentage of water in the soil. Figure 2 shows the tree and the tape measure. Figure 2 10 12 14 16 18 20 metres 02468 This is the method used for finding the percentage of water in each soil sample (step 4): 5. Weigh an empty container. 6. Place the soil sample in the container and weigh again. 7. Heat the container of soil in an oven at 100 °C for several hours. 8. Allow the container of soil to cool and weigh again. 9. Repeat steps 7 and 8 until there is no further change in mass. IMAI IB/G/Jun25/8461/2H Do not write outside the box Do not write outside the [o[2|.[4] Suggest why the students repeated steps 7 and 8 until there was no further change BOK in mass. [1 mark] Question 2 continues on the next page Turn over > MUN IB/G/Jun25/8461/2H 5 Do not write outside the [o[2|.[4] A student concluded: ‘box ‘As the water content of the soil increases, so does the number of daisy plants.’ Describe two changes to the investigation that would increase the validity of the student's conclusion. [2 marks] [o[2].[5| The percentage of water in the soil is an abiotic factor. Suggest three other abiotic factors that might have caused more daisy plants to grow further away from the tree. Do not refer to water in your answer. [3 marks] Turn over for the next question Turn over > 07 IB/G/Jun25/8461/2H 7 Do not write outside the Tropisms help plants survive. box [1] What is geotropism? [2 marks] [0 [3].[2] Plan an investigation to find the effect of the direction of light on the growth of plant seedlings. You may use the equipment shown in Figure 3 and any other laboratory equipment. [6 marks] Figure 3 Lamp Slit Cardboard box Cardboard box with slit cut in one side IMA IB/G/Jun25/8461/2H 8 10 Do not write outside the Plant responses are controlled by hormones. box [o[3].[3| Which hormone controls a plant's response to the direction of light? [1 mark] [o[3].[4| How does the hormone you named in Question 03.3 control the plant's response to the direction of light? [1 mark] Tick (“) one box. All parts of the plant have the same concentration of hormone. The hormone has an effect when it breaks down. There is an uneven distribution of the hormone. [o[3].[5| Explain how a plant's response to light helps the plant survive. [3 marks] 13 10 IB/G/Jun25/8461/2H 10 11 Do not write outside the Human growth hormone (hGH) is made by the pituitary gland. box [o[4].[4| Name one other hormone made by the pituitary gland. [1 mark] [o|4}.[2] hGH is a protein. A child with a deficiency of hGH can be given injections of hGH. What would happen to the hGH if it was given as a tablet that was swallowed? [1 mark] Question 4 continues on the next page Turn over > 11 IB/G/Jun25/8461/2H 11 [o[4|.[4] Growth hormone (GH) can be extracted from the urine of farm animals. 13 It is better to use hGH made by genetic engineering than to use GH from the urine of farm animals. Suggest two reasons why. Do not refer to ethical reasons or religious beliefs in your answer [2 marks] Do not write outside the box 13 Turn over for the next question Turn over > IB/G/Jun25/8461/2H 13 14 Do not write outside the Peat bog is a specialised habitat for some living organisms. box [o[5|.[1] Peat has been removed from peat bogs so that the land can be used for farming or forestry. Give two uses of the peat removed from peat bogs. [2 marks] 1 2 The destruction of peat bogs can affect biodiversity. [o[5].[2| What is meant by ‘biodiversity’? [1 mark] 14 IB/G/Jun25/8461/2H 14 16 Do not write outside the New cells are produced by cell division. bak Figure 5 shows sperm formation in a human. Figure 5 @) —_—_—_———- ivision 1 os oe CMROMEOMEO |s rowth Cell division 2 |«——— Cell differentiation G H I { | | { Sperm cells INIT IB/G/Jun25/8461/2H 16 17 Do not write outside the [o[6|.[1] Which cell division in Figure 5 represents mitosis? box [1 mark] Tick (“) one box. Cell division 1 Cell division 2 Cell division 3 [o[6|.[2] Which two cells in Figure 5 are genetically identical? [1 mark] Tick (“) one box. AandCc Band! FandJ GandH [o[6].[3| How many chromosomes are there in cell J in Figure 5? [1 mark] [o[6].[4| How many of the cells C, D, E, F, G, H, | and J contain a Y chromosome? Use Figure 5. [1 mark] Question 6 continues on the next page Turn over > 17 IB/G/Jun25/8461/2H 17 19 Do not write outside the [o[6|.[6] Explain why the offspring produced using flowers, fruits and seeds BOK are not genetically identical. [2 marks] Describe two advantages of asexual reproduction for the survival of strawberry plants. [2 marks] 1 2 [o[6].[38| Describe two advantages of sexual reproduction for the survival of strawberry plants. [2 marks] Turn over for the next question Turn over > ll 9 IB/G/Jun25/8461/2H 19 Inn 20 Do not write outside the Two students investigated reaction time. bak This is the method used. 1. Student A holds a metre rule just above student B’s hand, as shown in Figure 7. 2. Student A lets go of the metre rule. 3. Student B catches the metre rule as quickly as possible. 4. Student A writes down the reading from the scale on the metre rule. 5. Students A and B repeat steps 1 to 4 another six times. Figure 7 Midey 4 Hand of Student'A, 2 puudent Reading on metre rule = 18cm —> Table 3 shows the results. Table 3 Test Reading on metre rule in cm 1 18 2 15 3 12 4 16 5 14 6 23 7 14 Mean 16 INT IB/G/Jun25/8461/2H 20 
