Biotechnology — Paper 1 · IGCSE Biology (9-1) 0970

38 Some washing powders are called biological washing powders. What is the reason for this? A They contain bacteria. B They contain enzymes. C They contain myriapods. D They contain viruses.

1 marks

Answer: B

This question in 0970/11 May/June 2018

37 The production of ethanol for biofuels involves two stages. Firstly, starch is converted to glucose by … 1 … . Secondly, glucose is converted to ethanol by … 2 … during … 3 … . Which row correctly completes gaps 1, 2 and 3? 1 2 3 A enzymes bacteria aerobic respiration B enzymes yeast anaerobic respiration C pectinase bacteria aerobic respiration D pectinase yeast anaerobic respiration

1 marks

Answer: B

This question in 0970/12 Oct/Nov 2018

38 Why are bacteria useful in biotechnology and genetic engineering? A They can reproduce rapidly. B They live in soil. C They may be pathogens. D They need complex nutrients.

1 marks

Answer: A

This question in 0970/11 May/June 2019

37 What is the role of anaerobic respiration in bread-making? A to produce alcohol to flavour the bread B to produce gas to make the bread rise C to release enough energy to bake the bread D to release enough lactic acid to kill the yeast

1 marks

Answer: B

This question in 0970/11 May/June 2020

37 What is the role of anaerobic respiration in bread-making? A to produce alcohol to flavour the bread B to produce gas to make the bread rise C to release enough energy to bake the bread D to release enough lactic acid to kill the yeast

1 marks

Answer: B

This question in 0970/12 May/June 2020

39 What is a use of pectinase in the food industry? A to extract juice from fruit B to make biofuels C to make biological washing powders D to make bread rise

1 marks

Answer: A

This question in 0970/11 May/June 2021

24 Yeast is an organism used in the production of biofuels. Which statement describes why yeast is used for biofuel production? A Yeast respires aerobically to produce carbon dioxide. B Yeast respires aerobically to produce carbon dioxide and ethanol. C Yeast respires anaerobically to produce carbon dioxide. D Yeast respires anaerobically to produce carbon dioxide and ethanol.

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2021

39 What is the useful product of anaerobic respiration in the manufacture of bread? A carbon dioxide B ethanol C lactic acid D oxygen

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2021

40 Bacteria are useful for manufacturing products for human use. Which statement explains why they are useful? A Bacteria can be grown without nutrients. B Bacteria do not have a nucleus. C Bacteria infect human cells. D Bacteria reproduce very rapidly.

1 marks

Answer: D

This question in 0970/12 May/June 2023

34 What is a use of yeast in biotechnology? A aerobic respiration to make biofuels B anaerobic respiration to make bread C aerobic respiration to make alcohol D anaerobic respiration to make human proteins

1 marks

Answer: B

This question in 0970/11 May/June 2024

40 Why are bacteria used in biotechnology? A Bacteria reproduce rapidly. B Bacterial cells contain a nucleus. C Bacterial cells contain cytoplasm. D Bacterial cells do not produce complex molecules.

1 marks

Answer: A

This question in 0970/11 May/June 2024

39 What is a use of ethanol? A biofuel production B biological washing powder C bread-making D fruit juice production

1 marks

Answer: A

This question in 0970/12 May/June 2024

40 The diagram shows a label found on a container of biological washing powder. Biological washing powder • works at low temperatures • contains protease • contains lipase • keep out of reach of children Which stains does the washing powder remove? food stain food stain food stain food stain containing containing containing containing oil carbohydrates protein fat A ✓ ✓ ✗ ✗ key B ✓ ✗ ✗ ✓ ✓= yes C ✗ ✓ ✓ ✓ ✗= no D ✗ ✗ ✓ ✗

1 marks

Answer: C

This question in 0970/12 May/June 2024

38 Why are bacteria useful in biotechnology and genetic modification? 1 They can make complex molecules. 2 They have a rapid reproduction rate. 3 They have cell walls. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0970/12 May/June 2025

39 The graph shows how changing the temperature affects the rate of stain removal from clothes, using a biological washing powder. rate at which stains are removed 0 10 20 30 40 50 60 temperature / °C What does the graph suggest about biological washing powders? A Biological washing powders contain enzymes. B Biological washing powders work best at all temperatures above 40 °C. C The optimum temperature for the reaction is between 10 °C and 30 °C. D There is a directly proportional relationship between the temperature used and the rate at which stains are removed.

1 marks

Answer: A

This question in 0970/12 May/June 2025

40 The flow chart shows some of the processes involved in making biofuel. grind up plant add organism L filter to biomass for anaerobic extract M biofuel remove waste to extract K respiration of K What are represented by K, L and M in the diagram? K L M A ethanol bacteria glucose B glucose yeast ethanol C glucose bacteria water D lactic acid yeast glucose

1 marks

Answer: B

This question in 0970/12 May/June 2025

40 Biological washing powders contain enzymes. Which enzyme removes an oil stain from clothes? A amylase B lipase C pectinase D protease

1 marks

Answer: B

This question in 0970/12 Oct/Nov 2025