Partial preview of the text
Download Actual 2024 AQA GCSE BIOLOGY 8461/2H Paper 2 Higher Tier Question Paper + Mark Scheme Actu and more Exams Biology in PDF only on Docsity!
2024 AQA GCSE SPANISH 8698/LF Paper 1 Listening Foundation Tier 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 BIOLOGY Higher Tier Paper 2H Friday 7 June 2024 Afternoon Time allowed: 1 hour 45 minutes Materials For this paper you must have: °a ruler . Question Mark * ascientific calculator. 1 For Examiner's Use Instructions e 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. e Inall calculations, show clearly how you work out your answer. e|/NJoalalaslo|nr TOTAL Information e The maximum mark for this paper is 100. « The marks for questions are shown in brackets. e You are expected to use a calculator where appropriate. « You are reminded of the need for good English and clear presentation in your answers. HOUTEN 4846124H 8461/2H IB/H/Jun24/E14 Answer all questions in the spaces provided. Do not write outside the box Evolution of new species occurs by mutation and natural selection. [o[1].[1] What is a mutation? [1 mark] [o[1].[2] Describe the process of natural selection. [3 marks] [o[1].[3| Which scientists suggested the theory of evolution by natural selection? Tick (“) one box. Alexander Fleming and Carl Woese Alfred Wallace and Alexander Fleming Alfred Wallace and Charles Darwin Charles Darwin and Carl Woese 02 [1 mark] IB/H/Jun24/8461/2H 2 Do not write outside the Peat bogs are estimated to contain twice as much carbon as all the world’s forests. Bok Figure 2 shows a section through part of a peat bog. Figure 2 Other plants Sundew Layer A contains a lot of air. Layer B: e contains the dead remains of plants e has a low pH e contains very little oxygen ¢ contains carbon dioxide and methane. IMI IB/H/Jun24/8461/2H 4 Do not write outside the [o[2]}.[1] Explain why most of the dead remains of plants in layer B do not decay. box [3 marks] [o[2].[2] The peat bog in Figure 2 is a stable community. The moss produces biomass at a rate of 340 g/m?/year. What is the approximate biomass of the moss that becomes biomass in primary consumers? [1 mark] Tick (W) one box. 0.34 gim’/year 3.4 gim’ year 34 gim’/year 340 gim’lyear Question 2 continues on the next page Turn over > 05 IB/H/Jun24/8461/2H 5 [o[2].[5] Humans have destroyed large areas of peat bog to collect peat. IMI The peat provides fuel and provides compost for gardeners to use. The peat comes from layer B in Figure 2 on page 4. Layer B: « contains the dead remains of plants e has a low pH e contains very little oxygen e contains carbon dioxide and methane. Figure 3 shows the removal of peat from a peat bog. Figure 3 Peat is dug out and cut into ‘bricks’ that are left to dry Explain how the destruction of peat bogs and the use of peat affects the temperature of the Earth’s atmosphere. [4 marks] Do not write outside the box Turn over > IB/H/Jun24/8461/2H Do not write outside the box Turn over for the next question DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED IMI IB/H/Jun24/8461/2H 8 10 Do not write outside the Table 1 shows the results. box Table 1 Sample Number of tadpoles in each sample number 0 weeks 1 week | 2weeks | 3 weeks | 5weeks | 8 weeks 1 11 17 8 9 5 0 2 15 11 12 7 0 5 3 23 16 14 10 7 3 4 11 14 16 xX 4 4 Totals 60 58 50 32 16 12 [o[3].[2| Value X is the number of tadpoles in sample 4, at 3 weeks. Calculate value X. [1 mark] Value X = IB/H/Jun24/8461/2H 10 11 Do not write outside the [0[3].[3| Complete Figure 4 to show how the total number of tadpoles changed over the Bok 8 weeks. [4 marks] You should: ¢ label the x-axis * use a suitable scale for the x-axis ¢ plot the data for the total numbers of tadpoles from Table 1 ¢ draw a line of best fit. Figure 4 60 50 Total number 20 of tadpoles 30 20 10 [o[3|.[4] After 0 weeks, no more tadpoles hatched in the pond. Calculate the percentage of the tadpoles that would still be found in the pond at 4 weeks compared with 0 weeks. Use information from Figure 4. [3 marks] Percentage of tadpoles found at 4 weeks = % Turn over > IMI IB/H/Jun24/8461/2H 11 13 Do not write outside the box Turn over for the next question DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED Turn over > IMI IB/H/Jun24/8461/2H 13 14 A student investigated the effect of gravity on the growth of bean seedlings. The student put ink marks on the root of each bean seedling. Figure 5 shows a bean seedling with ink marks. Figure 5 Ink marks Se Annan Root Bean seed The student set up apparatus A and apparatus B. Figure 6 shows both sets of apparatus. Figure 6 Cork mat Bean seedlings Damp blotting paper Rotates | ea a Motor f C=— s es o- Se Ca LI Pin ] Apparatus A Apparatus B Stationary Rotating slowly The student left both sets of apparatus in a dark cupboard for 24 hours. IB/H/Jun24/8461/2H Do not write outside the box 14 16 Do not write outside the [0[4].[4| Figure 7 shows one seedling from apparatus A at the start of the investigation and Bok after 24 hours. The drawing of the seedling after 24 hours is not complete. Figure 7 SS “TIT lL Seedling at start . hours oy Seedling after 24 hours Complete Figure 7 to show: e the appearance of the root after 24 hours « the ink marks on the root after 24 hours. [3 marks] IM IB/H/Jun24/8461/2H 16 17 Figure 6 is repeated below. Figure 6 Cork mat Bean seedlings Damp blotting paper Rotates | ea o~ Motor { e— M ee o- Se ea LI Pin ] Apparatus A Apparatus B Stationary Rotating slowly The student left both sets of apparatus in a dark cupboard for 24 hours. [o[4].[5| Describe how a root from apparatus B would look different from the root you drew in Question 04.4. [1 mark] [o[4].[6| Auxin is a plant hormone. Explain how auxin causes the results in apparatus A. [2 marks] Question 4 continues on the next page Turn over > IB/H/Jun24/8461/2H Do not write outside the box 17 19 Do not write outside the box Turn over for the next question DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED Turn over > IB/H/Jun24/8461/2H 19 20 Do not write outside the The human body has two coordination systems: box e the nervous system e the endocrine system. [o[5].[1| Two students investigated human reaction time. Student A held a metre rule above student B’s hand. Student A then released the metre rule and student B caught the rule as quickly as possible. Figure 8 shows the method used. Figure 8 Metre rule Hand of held by ‘ student A 35 student B ; i Reading on metre rule = 18cm Suggest two ways to improve the students’ method for measuring human reaction time. [2 marks] IMU IB/H/Jun24/8461/2H 20 
