B2.6 Aerobic and anaerobic respiration Version 2.0 Copyright © AQA and its licensors. All rights reserved. Exampro Q BBB 05 F10 Q1. faster Paula is training for a marathon. When she runs, her heart beats than it does when she is resting. Complete the sentences, using words from the box. blood breathe heat carbon dioxide nitrogen oxygen glucose respire When she is running, Paula‘s muscle activity increases. To do this, her muscle cells ................................................. at a faster rate to give her more energy. Her muscles need to be supplied with ........................................... and ............................................................... more quickly. Her heart beats faster to increase the flow of ................................................. which carries the products ................................................................................................ and ............................................................ away from her muscles. (Total 6 marks) Version 2.0 Copyright © AQA and its licensors. All rights reserved. question answers extra information respire mar k 1 Oxygen/glucose or Each once only 1 Glucose/oxygen blood 1 carbon dioxide/heat or Each once only 1 Heat/carbon dioxide 1 Total Version 2.0 4 Copyright © AQA and its licensors. All rights reserved. • B2.6 Aerobic and anaerobic respiration Bio BL2HP June 2012 1.Glycogen is stored in the muscles. Scientists investigated changes in the amount of glycogen stored in the muscles of two 20 year-old male athletes, A and B. Athlete A ate a high-carbohydrate diet. Athlete B ate a low-carbohydrate diet. Each athlete did one 2-hour training session each day. The graph shows the results for the first 3 days. Version 2.0 Copyright © AQA and its licensors. All rights reserved. • B2.6 Aerobic and anaerobic respiration Bio BL2HP June 2012 1 (a) (i) Give three variables that the scientists controlled in this investigation. (3 marks) 1 (a) (ii) Suggest two variables that would be difficult to control in this investigation. (2 marks) 1 (a) (iii) Describe one way in which the results of Athlete B were different from the results of Athlete A. ( 1mark) 1 (b) Both athletes were training to run a marathon. Which athlete, A or B, would be more likely to complete the marathon? Use information from the graph to explain your answer.(4 marks) Version 2.0 Copyright © AQA and its licensors. All rights reserved. • Version 2.0 B2.6 Aerobic and anaerobic respiration Bio BL2HP June 2012 mark scheme Copyright © AQA and its licensors. All rights reserved. Exampro QBBB 05 H17 Q1. A student‘s breathing was monitored before and after vigorous exercise. The student breathed in and out through a special apparatus. The graphs show the changes in the volume of air inside the apparatus. Each time the student breathed in, the line on the graph dropped. Each time the student breathed out, the line went up. Version 2.0 Copyright © AQA and its licensors. All rights reserved. Version 2.0 Copyright © AQA and its licensors. All rights reserved. (a) How many times did the student breathe in per minute: before exercise; ........................................................................................................... after exercise? ............................................................................................................. (1 mark) (b) On each graph, the line A – B shows how much oxygen was used. The rate of oxygen use before exercise was 0.5 dm3per minute. Calculate the rate of oxygen use after exercise. ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... Rate of oxygen use after exercise = ............................................... dm 3 per minute (2 marks) Version 2.0 Copyright © AQA and its licensors. All rights reserved. (c) The breathing rate and the amount of oxygen used were still higher after exercise, even though the student sat down to rest. Why were they still higher? ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (4 marks) (Total 7 marks) Version 2.0 Copyright © AQA and its licensors. All rights reserved. M1. (a) (before exercise) – 9 to 11 and (after exercise) – 12 or 13 both correct (1) (b) 0.75 to 0.90 ignore working or lack of working eg. 2.35 – 1.55 or ((2.35-1.0) x 60)/100 or other suitable figures for 1 mark (2) (c) any four from: still need to remove extra carbon dioxide still need to remove heat / to cool (some) anaerobic respiration (in exercise) lactic acid made (in exercise) oxygen needed to break down lactic acid or suitable reference to oxygen debt lactic acid broken down to CO2 and water or lactic acid changed into glucose (4) [Total 7 marks] Version 2.0 Copyright © AQA and its licensors. All rights reserved.