Digestion — Paper 1 · IGCSE Sciences - Co-ordinated (Double) 0654

7 How do bacteria cause tooth decay? A They release alkalis that dissolve enamel. B They release ethanol that digests enamel. C They release acids that dissolve enamel. D They release enzymes that digest enamel.

1 marks

Answer: C

This question in 0654/11 May/June 2005

7 The diagram shows how a large food molecule is changed into smaller molecules. process X What is process X? A absorption B chewing C digestion D secretion

1 marks

Answer: C

This question in 0654/11 May/June 2007

6 The diagram shows a piece of Visking tubing (partially permeable) containing starch suspension, held in a beaker of pure water. Saliva, containing the enzyme amylase, is added to the starch and left for two hours. saliva Visking tubing starch suspension sugar now pure present water 10.00 am 12 noon What does the experiment show? A Amylase is a solvent for starch. B Saliva passes through the Visking tubing. C Starch can be changed to sugar. D Starch is soluble in pure water.

1 marks

Answer: C

This question in 0654/11 May/June 2009

8 What is most likely to happen after a person eats a meal high in protein? A The amount of water in the blood would decrease. B The concentration of urea in the urine would increase. C The level of insulin in the blood would increase. D The temperature of the body would decrease.

1 marks

Answer: B

This question in 0654/11 May/June 2009

4 The diagram shows part of the digestive system. Where does lipase digest fat? C B stomach A D

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2010

2 How do bacteria cause tooth decay? A They release acids that dissolve enamel. B They release alkalis that dissolve enamel. C They release enzymes that digest enamel. D They release ethanol that digests enamel.

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2010

5 The diagram shows part of the digestive system. Where does lipase digest fat? C B stomach A D

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2010

1 How do bacteria cause tooth decay? A They release acids that dissolve enamel. B They release alkalis that dissolve enamel. C They release enzymes that digest enamel. D They release ethanol that digests enamel.

1 marks

Answer: A

This question in 0654/13 Oct/Nov 2010

7 The diagram shows part of the digestive system. Where does lipase digest fat? C B stomach A D

1 marks

Answer: A

This question in 0654/13 Oct/Nov 2010

7 The diagram shows part of the alimentary canal. P Q R S Where is bile added and where is acid released? addition of bile release of acid A P Q B Q R C R S D S P

1 marks

Answer: A

This question in 0654/11 May/June 2011

7 The diagram shows some parts of the alimentary canal and its associated organs. P Q R S Which organs produce digestive enzymes? A P and Q B Q and R C R and S D S and P

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2011

10 The diagram shows some parts of the alimentary canal and its associated organs. P Q R S Which organs produce digestive enzymes? A P and Q B Q and R C R and S D S and P

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2011

6 The diagram shows a tooth with a cavity caused by decay. cavity Which part of the tooth has been exposed by the decay? A enamel B dentine C pulp D root

1 marks

Answer: B

This question in 0654/12 May/June 2012

6 The diagram shows a tooth with a cavity caused by decay. cavity Which part of the tooth has been exposed by the decay? A enamel B dentine C pulp D root

1 marks

Answer: B

This question in 0654/13 May/June 2012

4 The diagram shows part of the digestive system. Where is lipase produced? C D B A

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2014

1 The following three equations represent metabolic processes. 1 glucose → glycogen 2 carbon dioxide + water → glucose + oxygen 3 oxygen + glucose → carbon dioxide + water Which equations represent nutrition and respiration? nutrition respiration A 1 2 B 2 3 C 3 1 D 3 2

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2015

2 Which is an enzyme involved in the digestion of proteins in the stomach? A amylase B bile C lipase D protease

1 marks

Answer: D

This question in 0654/11 May/June 2016

3 What are the products when oil is digested? A amino acids and glycerol B fats and amino acids C fatty acids and glycerol D fatty acids and sugars

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2016

3 An enzyme from the alimentary canal has an optimum activity at an acidic pH. Which statement is correct? A The enzyme is an amylase and is found in the mouth. B The enzyme is a protease and is found in the mouth. C The enzyme is an amylase and is found in the stomach. D The enzyme is a protease and is found in the stomach.

1 marks

Answer: D

This question in 0654/13 May/June 2017

4 The diagram shows part of the digestive system. P Q R S Which of the labelled parts produce digestive enzymes, absorb water and store bile? produce digestive absorb water store bile enzymes A P Q R B Q R P C R S P D S P R

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2018

6 What is the correct definition of ingestion? A The breakdown of large, insoluble food molecules into small, water-soluble molecules. B The movement of digested food molecules through the wall of the small intestine into the blood. C The passing out of food that has not been digested, as faeces, through the anus. D The taking of substances into the body through the mouth.

1 marks

Answer: D

This question in 0654/12 May/June 2019

6 What is the correct definition of ingestion? A The breakdown of large, insoluble food molecules into small, water-soluble molecules. B The movement of digested food molecules through the wall of the small intestine into the blood. C The passing out of food that has not been digested, as faeces, through the anus. D The taking of substances into the body through the mouth.

1 marks

Answer: D

This question in 0654/13 May/June 2019

6 Which process can be defined as the movement of small, water-soluble food molecules through the wall of the intestine into the blood? A absorption B assimilation C digestion D egestion

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2019

6 The diagram shows the human alimentary canal. X What is the name of organ X and which process occurs here? organ process A large intestine absorption B large intestine egestion C small intestine absorption D small intestine egestion

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2020

6 Which term is defined as the movement of digested food molecules into the cells of the body where they are used? A assimilation B absorption C egestion D ingestion

1 marks

Answer: A

This question in 0654/11 May/June 2021

6 The diagram shows the human digestive system. 1 2 3 4 Where do digestion, egestion, ingestion and absorption take place? digestion egestion ingestion absorption A 1 4 2 3 B 2 4 1 3 C 3 1 4 2 D 4 3 2 1

1 marks

Answer: B

This question in 0654/12 May/June 2021

6 What is the name of the process which moves soluble food molecules through the wall of the small intestine into the blood? A absorption B assimilation C digestion D ingestion

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2021

6 What is assimilation? A the movement of digested food molecules into the cells of the body where they are used, becoming part of the cells B the movement of digested food molecules through the wall of the intestine into the blood C the passing out of food that has not been digested, as faeces, through the anus D the taking of food and drink into the body through the mouth

1 marks

Answer: A

This question in 0654/12 Feb/March 2022

6 The diagram shows part of the digestive system. P Q R S Which labelled parts produce digestive enzymes, absorb water and store bile? produce digestive absorb water store bile enzymes A P Q R B Q R P C R S P D S P R

1 marks

Answer: C

This question in 0654/12 May/June 2022

6 The diagram shows part of the digestive system. P Q R S Which labelled parts produce digestive enzymes, absorb water and store bile? produce digestive absorb water store bile enzymes A P Q R B Q R P C R S P D S P R

1 marks

Answer: C

This question in 0654/13 May/June 2022

6 Dogs are mammals and have the same types of teeth as humans. Which tooth is a canine? B A D C

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2022

4 Which process involves enzymes? A absorption B digestion C egestion D ingestion

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2022

6 Which statements about chemical digestion are correct? 1 It breaks food into smaller pieces. 2 It converts small molecules into larger ones. 3 It produces molecules that can be absorbed. 4 It produces small molecules. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: D

This question in 0654/12 Feb/March 2023

4 Which type of molecules speed up chemical digestion? A carbohydrates B enzymes C hormones D fatty acids

1 marks

Answer: B

This question in 0654/12 May/June 2023

4 Which type of molecules speed up chemical digestion? A carbohydrates B enzymes C hormones D fatty acids

1 marks

Answer: B

This question in 0654/13 May/June 2023

6 Starch is mixed with saliva and placed into a bag made of a partially permeable membrane. The bag is placed into a tube filled with water, as shown. water starch and saliva partially permeable membrane After one hour, sugar molecules are found in the water outside the bag. Which process has taken place inside the bag? A assimilation B digestion C egestion D ingestion

1 marks

Answer: B

This question in 0654/11 May/June 2024

3 What are the products when oils are digested? A amino acids and glycerol B fats and amino acids C fatty acids and glycerol D fatty acids and sugars

1 marks

Answer: C

This question in 0654/12 May/June 2024

6 A scientist places equal volumes of starch and saliva into a test-tube. After 30 minutes, the mixture in the test-tube is tested with iodine solution. The iodine solution remains brown. Which process does this experiment demonstrate? A absorption B assimilation C digestion D ingestion

1 marks

Answer: C

This question in 0654/12 May/June 2024

3 What are the products when oils are digested? A amino acids and glycerol B fats and amino acids C fatty acids and glycerol D fatty acids and sugars

1 marks

Answer: C

This question in 0654/13 May/June 2024

6 A scientist places equal volumes of starch and saliva into a test-tube. After 30 minutes, the mixture in the test-tube is tested with iodine solution. The iodine solution remains brown. Which process does this experiment demonstrate? A absorption B assimilation C digestion D ingestion

1 marks

Answer: C

This question in 0654/13 May/June 2024