OCR Oxford and RSA Tuesday 17 May 2022 — Morning GCSE (9—1) Biology A (Gateway Science) J247103 Paper 3 (Higher Tier) Time allowed: 1 hour 45 minutes

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INSTRUCTIONS • Use black ink. You can use an HB pencil, but only for graphs and diagrams. • Write your answer to each question in the space provided. If you need extra space use the lined page... s at the end of this booklet. The question numbers must be clearly shown. • Answer all the questions. • Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong. INFORMATION • The total mark for this paper is 90. • The marks for each question are shown in brackets [ ]. • Quality of extended response will be assessed in questions marked with an asterisk (*). • This document has 28 pages. ADVICE • Read each question carefully before you start your answer. You must have: • a ruler (cm/mm) You can use: • a scientific or graphical calculator • an HB pencil Tuesday 17 May 2022 – Morning GCSE (9–1) Biology A (Gateway Science) J247/03 Paper 3 ( Higher Tier) Time allowed: 1 hour 45 minutes © OCR 2022 [601/8589/2] DC (MB/FC) 320449/7 R *8991835482* 2 © OCR 2022 SECTION A Answer all the questions. You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 Which row shows the correct type of reaction for photosynthesis and for respiration? Photosynthesis Respiration Type of Reaction A endothermic endothermic B exothermic exothermic C endothermic exothermic D exothermic endothermic Your answer [1] 3 © OCR 2022 Turn over 2 The diagram shows a potometer. Narrow tube Tap Water Water 0 1 2 3 4 5 6 7 8 9 10 Gas bubble A student wants to test the hypothesis that the number of stomata on a plant affects water loss. They first record the distance the gas bubble moves in 10 minutes. What should the student do next before taking a second reading to test this hypothesis? A Cover the plant with a black plastic bag. B Remove some of the leaves. C Repeat the test in a warmer room. D Use an electric fan to move the air. Your answer [1] 3 Transpiration will occur fastest in which conditions? A A cold and windy environment B A dark and cold environment C A dark and warm environment D A warm and windy environment Your answer [1] 4 © OCR 2022 4 Which adaptation of xylem helps prevent water leaving the xylem vessels? A Lignin in the walls of the xylem B Pits (holes) in the walls of the xylem C The breakdown of cross walls between cells that make up the xylem D The lack of cell contents in the cells that make up the xylem Your answer [1] 5 Water moves into root hair cells due to differences in water potentials. Which term describes this process? A Active transport B Diffusion C Osmosis D Translocation Your answer [1] 6 Which hormone should be used to ripen fruit? A Ethene B FSH C Gibberellins D Thyroxine Your answer [1] 5 © OCR 2022 Turn over 7 An elephant has 56 chromosomes in a stomach cell. How many chromosomes will there be in an elephant’s ear cell? A 23 B 28 C 56 D 112 Your answer [1] 8 Liver cells are active cells producing many protein molecules. Which organelles are present in liver cells? A Chloroplasts and mitochondria B Mitochondria and plasmids C Nuclei and ribosomes D Ribosomes and plasmids Your answer [1] 9 A student cuts a cube of potato to use in an experiment. Each face of the cube is 2cm by 2cm. What is the surface area : volume ratio of the cube? A 3 : 1 B 4 : 8 C 8 : 24 D 16 : 8 Your answer [1] 6 © OCR 2022 10 Farmers can control a cow’s menstrual cycle using hormones. Hormones controlling the menstrual cycle of a cow are the same as those in humans. Which hormone would a farmer use to stimulate egg production? A FSH B LH C Oestrogen D Progesterone Your answer [1] 11 The table shows some features of blood vessels. Valves along the length Thickness of walls Diameter of lumen A yes thick wide B no thin narrow C yes thin wide D no thick narrow Which row in the table correctly describes the structure of arteries? Your answer [1] 12 In a sample of DNA, 37% of the bases are thymine (T). What will be the percentage of the other bases in this sample? A Adenine (A) 13%, Cytosine (C) 13%, Guanine (G) 37% B Adenine (A) 37%, Cytosine (C) 13%, Guanine (G) 13% C Adenine (A) 0%, Cytosine (C) 37%, Guanine (G) 26% D Adenine (A) 21%, Cytosine (C) 21%, Guanine (G) 21% Your answer [1] 7 © OCR 2022 Turn over 13 The graph shows how the DNA content of a cell changes during the cell cycle. A B C DNA D content Time Which part of the graph A, B, C or D represents DNA replication? Your answer [1] 14 The cell cycle consists of the following stages: 1. Cell growth 2. Movement of chromosomes 3. DNA replication Which is the correct order of the stages in one cell cycle? A 1, 2, 3, 2 B 1, 3, 1, 2 C 2, 1, 3, 1 D 2, 3, 1, 3 Your answer [1] 8 © OCR 2022 15 In experiments about photosynthesis, it is often necessary to compare light intensities. Which equation gives the light intensity at a distance (d) from a light source? A Light intensity = 1/d B Light intensity = 1/d2 C Light intensity = d – 1 D Light intensity = d × 2 1 Your answer [1] 9 © OCR 2022 Turn over BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE 10 © OCR 2022 SECTION B Answer all the questions. 16 Lipase is an enzyme produced in the human digestive system. It breaks down lipids. (a) Fig. 16.1 shows the steps in lipid digestion. Fig. 16.1 Step 1 Step 3 Step 2 ........................molecules ........................molecules ........................molecule Step 4 (i) Complete the labels in Fig. 16.1. [3] (ii) Lipase is found in the small intestine where the pH is alkaline. Draw a curve on Fig. 16.2 to show the effect the pH will have on the rate of reaction for the digestion of lipids by lipase. Fig. 16.2 4 5 6 7 8 pH Rate of reaction 9 10 11 12 [2] 11 © OCR 2022 Turn over (b) Phenolphthalein is an indicator that turns pink in an alkaline solution of pH10. When lipase breaks down lipids, the indicator goes colourless. A group of students investigate how temperature affects the enzymes that break down lipids found in milk. Describe an experiment that the students could use to investigate the effect of temperature on the breakdown of the lipids found in milk. In your description include: • how the independent variable could be changed • the observations that should be made • two variables that need to be controlled. To change the independent variable, I will ................................................................................ ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... The observations I make will be to ........................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... I will need to control .................................................................................................................. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... [5] 12 © OCR 2022 17 The female menstrual cycle is regulated by hormones. As women get older, they go through a stage called menopause when their periods stop. • Doctors can determine if a woman is going through menopause by measuring the level of FSH in their blood. • If the FSH level goes above 30mlU/mL, this indicates that menopause may have started. A patient has her FSH levels measured each month for six months as shown in the table. Month FSH level (mlU/mL) January 31 February 28 March 30 April 32 May 30 June 33 (a) (i) Complete the bar chart for the remaining values from the table. Finish the scales for both axes. [Show More]

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