2024 AQA GCSE COMBINED SCIENCE: TRILOGY 8464/B/2H Biology Paper 2H Question Paper + Mark S, Exams of Biology

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2024 AQA GCSE COMBINED SCIENCE: TRILOGY 8464/B/2HBiology Paper 2H Question Paper + Mark Scheme AQA Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature | declare this is my own work. GCSE COMBINED SCIENCE: TRILOGY Higher Tier Biology Paper 2H Friday 7 June 2024 Afternoon Time allowed: 1 hour 15 minutes Materials _ For this paper you must have: For Examiner's Use * aruler * ascientific calculator. Question Mark 1 Instructions 2 e Use black ink or black ball-point pen. 3 4 5 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 6 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 TOTAL marked. ¢ Inall calculations, show clearly how you work out your answer. Information ¢ The maximum mark for this paper is 70. « The marks for questions are shown in brackets. e You are expected to use a calculator where appropriate. e You are reminded of the need for good English and clear presentation in your answers. [re Do not write outside the box There are no questions printed on this page DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED MIN IB/M/Jun24/8464/B/2H Do not write outside the Students estimated the population of limpets on a sea shore. box The students were given a square quadrat. Figure 2 shows the quadrat. Figure 2 50 cm [o[1].[2} Calculate the area of the quadrat in m?. [2 marks] Area of quadrat = m? IMAI IB/M/Jun24/8464/B/2H Do not write outside the [o[1].[3| The total area of the sea shore was 1800 m?. box The students sampled 2% of the total area of the sea shore. Calculate the number of times the students needed to use the quadrat for the 2% sample. Use your answer from Question 01.2 [2 marks] Number of times = [o[1].[4] Explain why throwing a quadrat is not a random method to estimate population size. Do not refer to safety in your answer. [2 marks] Question 1 continues on the next page Turn over > 05 IB/M/Jun24/8464/B/2H Potatoes are a food crop. [o[2].[1] Potato plants are classified as eukaryota. What type of classification group is eukaryota? [1 mark] Tick (“) one box. Class Domain Kingdom Phylum [o[2].[2] Potato plants can reproduce by asexual reproduction. Which statement is true for asexual reproduction? [1 mark] Tick (“) one box. Meiosis occurs. Offspring are genetically identical. Pollen and egg cells are produced. Question 2 continues on the next page Turn over > 07 IB/M/Jun24/8464/B/2H Do not write outside the box [o[2][3) [o[2][4) 08 Do not write outside the Flowers of potato plants contain gametes for sexual reproduction. box How is a gamete different from other cells in a potato plant? [1 mark] Tick (“) one box. A gamete contains one-quarter of the number of chromosomes. A gamete contains half of the number of chromosomes. A gamete contains double the number of chromosomes. Plants in the same genus as potatoes have been studied by scientists. Describe one way a new plant species could be identified as being in the same genus as potatoes. [1 mark] IB/M/Jun24/8464/B/2H 10 10 Do not write outside the AKU is a genetic disorder. bok Figure 3 shows the inheritance of AKU in one family. Figure 3 O A B O O c D E F G ) H I J K L M Key [BW Mate who has AKU @ Female who has AKU Male who does not have AKU O Female who does not have AKU [o[3|.[4] Describe how Figure 3 shows that the allele for AKU is recessive. [1 mark] [o[3].[2] Which person is definitely heterozygous for AKU? Tick (“) one box. [1 mark] c D E G IB/M/Jun24/8464/B/2H INI 11 11 Do not write outside the [o[3].[3| A female who has AKU and a male who is heterozygous for AKU plan to have a child. bok Determine the probability that the child will have AKU. You should: ¢ complete Figure 4 ¢ identify the phenotype of each offspring genotype e use the symbols: A= dominant allele a = recessive allele. [5 marks] Figure 4 Female Male Probability that the child will have AKU = Question 3 continues on the next page Turn over > INI IB/M/Jun24/8464/B/2H 13 13 Do not write outside the [o[3].[6| Embryos can be screened to detect inherited disorders. bok Give two arguments against embryo screening. Do not refer to religion in your answer. [2 marks] 1 2 15 Turn over for the next question Turn over > IB/M/Jun24/8464/B/2H IM 14 14 Do not write outside the box There are no questions printed on this page DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED INI IB/M/Jun24/8464/B/2H [o[4].[2| The size of a rat population can increase quickly. 16 16 One female rat and one male rat can produce 20 offspring every 2 months. Warfarin is a poison that has been used to control rat populations. Rat populations can become resistant to warfarin by the process of evolution. A population of rats was given warfarin for 4 months. Table 1 shows information about resistance to warfarin in the rat population for a year after warfarin was first given. Table 1 Number of months since Was warfarin being Percentage (%) of rat . . . . population resistant to warfarin was first given given? warfarin 0 Yes 1 2 Yes 24 4 Yes 81 6 No 99 8 No 92 10 No 85 12 No 70 16 IB/M/Jun24/8464/B/2H 17 17 17 Do not write itside the Rats with resistance to warfarin have a smaller mean mass than rats that OK are not resistant to warfarin. Smaller rats are often at a disadvantage when competing against larger rats. Explain the trends in the data when warfarin was being given and when warfarin was no longer given. Use Table 1. [6 marks] 8 Turn over for the next question Turn over > IB/M/Jun24/8464/B/2H 19 19 Do not write outside the [o[5].[2| Otters are an important species for the stability of the river community. bok Describe two ways animal species may be important for the stability of a whole community. [2 marks] Question 5 continues on the next page Turn over > IB/M/Jun24/8464/B/2H 20 20 Sewage was accidentally added to a river. The sewage moved with the river water and affected: « the number of bacteria in the water e the concentration of dissolved oxygen in the water. Samples of river water were analysed at different distances from where the sewage was added. Table 2 shows the results. Table 2 Distance from where Number of bacteria Concentration of dissolved sewage was added in km * 1000/mm?* oxygen in mg/dm? 0.0 4 5.4 1.0 75 4.8 2.0 125 4.3 3.0 145 3.8 4.0 160 3.3 5.0 216 2.7 [o[5|.[3] The number of bacteria at 5.0 km was greater than the number of bacteria where the sewage was added. Calculate how many times greater. [1 mark] 20 Number of times greater = IB/M/Jun24/8464/B/2H Do not write outside the box