Respiration — Paper 2 · IGCSE Biology (9-1) 0970

11 An experiment was carried out using the apparatus shown. The carbon dioxide content of the water in each test-tube was measured at the start and again three hours later. In which test-tube would there be a decrease in carbon dioxide content? A B C D black polythene water to keep out light light light light water plant water snail

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2018

20 The graph shows changes in the volume of air in the lungs of a person at rest, over a period of 30 seconds. 2 volume of air in lungs 1 / dm3 0 0 30 time / s Which graph shows changes in the volume of air in the lungs of the same person immediately after they have done five minutes of vigorous exercise? A B 2 2 volume volume of air in of air in lungs 1 lungs 1 / dm3 / dm3 0 0 0 30 0 30 time / s time / s C D 2 2 volume volume of air in of air in lungs 1 lungs 1 / dm3 / dm3 0 0 0 30 0 30 time / s time / s

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2018

11 The diagram shows an experiment to investigate the balance between respiration and photosynthesis. In which tube are photosynthesis and respiration taking place at the same time? A B C D black water polythene to keep snail out light light light light pond weed

1 marks

Answer: C

This question in 0970/21 May/June 2019

23 Which statement about both aerobic and anaerobic respiration is correct? A They break down C6H12O6. B They produce an oxygen debt. C They use CO2. D They use O2.

1 marks

Answer: A

This question in 0970/21 May/June 2019

36 Decomposers play an important role in the carbon cycle. They release carbon dioxide. Which process is responsible for this? A feeding B fossilisation C photosynthesis D respiration

1 marks

Answer: D

This question in 0970/21 May/June 2019

1 Carbon dioxide diffuses into a leaf. Which characteristic of living things requires this? A excretion B movement C nutrition D respiration

1 marks

Answer: C

This question in 0970/22 May/June 2019

11 The diagram shows an experiment to investigate the balance between respiration and photosynthesis. In which tube are photosynthesis and respiration taking place at the same time? A B C D black water polythene to keep snail out light light light light pond weed

1 marks

Answer: C

This question in 0970/22 May/June 2019

10 An experiment is set up to investigate gas exchange in aquatic plants. hydrogencarbonate indicator solution light aquatic plant The hydrogencarbonate indicator solution is orange at the start. Which colour is it after three hours? A blue-black B orange C purple D yellow

1 marks

Answer: C

This question in 0970/21 May/June 2020

12 Four test-tubes are set up as shown. Which test-tube contains the least carbon dioxide after one hour? A B C D black water polythene to keep aquatic out light animal light light light aquatic plant

1 marks

Answer: C

This question in 0970/21 May/June 2020

21 The diagram shows an experiment to investigate the respiration of yeast. Oil prevents oxygen entering the glucose and yeast suspension. delivery tube thin layer of oil bubble of gas glucose and yeast limewater suspension If no oxygen is present in the glucose and yeast suspension, what will occur? A Ethanol will be produced and the limewater will stay clear. B Ethanol will be produced and the limewater will go cloudy. C Lactic acid will be produced and the limewater will stay clear. D Lactic acid will be produced and the limewater will go cloudy.

1 marks

Answer: B

This question in 0970/21 May/June 2020

21 The substances listed are associated with aerobic respiration. 1 carbon dioxide 2 glucose 3 oxygen 4 water Which substances are the products of aerobic respiration? A 1 and 3 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0970/22 May/June 2020

22 The formula C2H5OH represents a chemical produced during anaerobic respiration. What is this chemical? A alcohol B glucose C glycogen D lactic acid

1 marks

Answer: A

This question in 0970/22 May/June 2020

23 The list shows some processes that take place in a human body. 1 production of new red blood cells 2 transmission of nerve impulses from the eyes to the brain 3 diffusion of gases into and out of the lungs Which processes use energy released by respiration? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: A

This question in 0970/21 May/June 2021

23 What is the link between muscle contraction, protein synthesis and the maintenance of a constant body temperature? A They are controlled by hormones. B They are examples of homeostasis. C They require energy. D They require carbon dioxide.

1 marks

Answer: C

This question in 0970/22 May/June 2021

40 The process of eutrophication begins with the increased availability of nitrate ions and other ions in water. The processes involved in eutrophication are listed. 1 increased aerobic respiration by decomposers 2 increased death of producers due to lack of light 3 rapid growth of producers 4 oxygen concentration in the water decreases and more organisms die What is the correct sequence? A 3  2  1  4 B 3  4  2  1 C 4  1  2  3 D 4  1  3  2

1 marks

Answer: A

This question in 0970/22 May/June 2021

12 Two similar leaves are set up in test-tubes as shown. One is exposed to light, while the other is kept in the dark. green leaf green leaf black paper orange hydrogencarbonate indicator solution After a few hours, which colour would the hydrogencarbonate indicator solution be in each test-tube? light dark A colourless blue-black B purple yellow C red blue D yellow purple

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2021

1 All living organisms release energy from nutrient molecules within their cells. What is the name of this characteristic? A growth B nutrition C respiration D sensitivity

1 marks

Answer: C

This question in 0970/21 May/June 2022

22 What is the balanced chemical equation for anaerobic respiration in yeast? A C6H12O6  2CO2 + 6H2O B C6H12O6  6CO2 + 6H2O C C6H12O6  2C2H5OH + 2CO2 D C6H12O6  2C2H5OH + 2H2O

1 marks

Answer: C

This question in 0970/21 May/June 2022

11 Two test-tubes were filled with hydrogencarbonate indicator. An aquatic plant was placed into each test-tube and the test-tubes were sealed with bungs, as shown. hydrogencarbonate box that lamp excludes light indicator aquatic plants test-tube X test-tube Y Test-tube X was illuminated and test-tube Y was kept in the dark. The results are shown. colour of the hydrogencarbonate indicator test-tube at the start of at the end of the investigation the investigation X orange red Y orange yellow What causes the colour changes in the hydrogencarbonate indicator in X and Y? X Y A a decrease in the an increase in the concentration of carbon dioxide concentration of carbon dioxide B a decrease in the an increase in the concentration of oxygen concentration of oxygen C an increase in the a decrease in the concentration of carbon dioxide concentration of carbon dioxide D an increase in the a decrease in the concentration of oxygen concentration of oxygen

1 marks

Answer: A

This question in 0970/22 Oct/Nov 2022

21 Which process could continue without energy from respiration? A active transport B growth C osmosis D protein synthesis

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2022

11 An experiment is set up to investigate gas exchange in aquatic plants. hydrogencarbonate indicator solution light aquatic plant The hydrogencarbonate indicator solution is orange at the start. Which colour is it after three hours? A blue-black B orange C purple D yellow

1 marks

Answer: C

This question in 0970/21 May/June 2023

12 The diagram shows a cell with groups of bacteria around its edge. cell cytoplasm spiral-shaped chloroplast bacteria The bacteria have moved to areas of high oxygen concentration. Which process in the cell causes the bacteria to form these groups? A digestion B photosynthesis C reproduction D respiration

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2023

6 Which process requires energy from respiration? A active transport B diffusion C osmosis D transpiration

1 marks

Answer: A

This question in 0970/21 May/June 2024

24 Vigorous exercise can cause an oxygen debt. Which process removes the oxygen debt? A aerobic respiration of lactic acid in the liver B a decrease in breathing rate C a decrease in heart rate D an increase in blood supply to the skin

1 marks

Answer: A

This question in 0970/21 May/June 2024

4 A student made the following statements about the movement of ions by active transport. 1 It is the net movement of particles from a low concentration to a high concentration. 2 It is the net movement of particles from a high concentration to a low concentration. 3 It requires the use of energy from respiration. 4 It can only take place in living cells. Which statements are correct? A 1, 3 and 4 B 1 and 4 only C 2 and 4 D 2 only

1 marks

Answer: A

This question in 0970/21 May/June 2025

19 The processes listed occur in living organisms. 1 cell division 2 diffusion 3 muscle contraction 4 osmosis Which processes require energy from respiration? A 1, 2, 3 and 4 B 1 and 3 only C 2 and 3 only D 3 and 4 only

1 marks

Answer: B

This question in 0970/21 May/June 2025

21 What is the chemical formula of glucose? A C6H6O6 B C6HO6 C C6H12O6 D C12H12O6

1 marks

Answer: C

This question in 0970/22 May/June 2025

17 A person exercised vigorously for one minute and then rested for one hour. Which statements about lactic acid are correct? 1 During exercise, lactic acid is produced in the muscles and diffuses into the blood. 2 The blood transports lactic acid to the liver. 3 Lactic acid is broken down by anaerobic respiration. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 2 only

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2025