Digestion — Paper 2 · IGCSE Science - Combined 0653

3 Enzymes are used in digestion to break down larger molecules into smaller molecules. Which row matches the large molecules with the small molecules they are broken down into? large molecules small molecules A fat glycerol and fatty acids B glycogen glycerol and amino acids C protein simple sugars D starch amino acids

1 marks

Answer: A

This question in 0653/22 Oct/Nov 2018

3 What is defined as the breakdown of food into smaller pieces, without chemically changing the molecules? A absorption B chemical digestion C egestion D mechanical digestion

1 marks

Answer: D

This question in 0653/21 May/June 2019

4 The diagram shows an experiment at the start and one hour later. beaker water water and partially permeable simple sugars membrane starch solution plus Q start of experiment one hour later What is Q? A amylase B lipase C protease D water

1 marks

Answer: A

This question in 0653/21 May/June 2019

4 What is the purpose of mechanical digestion? A to break down food into smaller pieces B to break down insoluble foods into soluble particles C to change food so that it can be absorbed into the blood D to digest insoluble food components using enzymes

1 marks

Answer: A

This question in 0653/22 May/June 2019

4 1 cm³ of substance X is added to 10 cm³ starch suspension and mixed. Food tests are carried out immediately after mixing and again after an hour. The results of the tests are shown in the table. colour of solution colour of solution test reagent after mixing after one hour Benedict’s solution blue orange iodine solution blue / black brown What is substance X? A amylase B protease C lipase D sugar

1 marks

Answer: A

This question in 0653/22 Oct/Nov 2019

4 1 cm³ of substance X is added to 10 cm³ starch suspension and mixed. Food tests are carried out immediately after mixing and again after an hour. The results of the tests are shown in the table. colour of solution colour of solution test reagent after mixing after one hour Benedict’s solution blue orange iodine solution blue / black brown What is substance X? A amylase B protease C lipase D sugar

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2019

7 Which are absorbed from the alimentary canal into the blood? 1 fibre 2 glucose 3 vitamin C A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2019

4 Animals break down large, insoluble molecules into small, soluble molecules in the alimentary canal. What is this process? A chemical digestion B chemical ingestion C mechanical digestion D mechanical ingestion

1 marks

Answer: A

This question in 0653/22 Feb/March 2020

4 Which row correctly matches the enzyme to the products? enzyme products A lipase amino acids only B lipase glycerol and fatty acids C protease fatty acids only D protease glycerol and amino acids

1 marks

Answer: B

This question in 0653/21 May/June 2020

5 What are the correct substrate and products for lipase? substrate products A fat amino acids B fat fatty acids and glycerol C protein amino acids D protein fatty acids and glycerol

1 marks

Answer: B

This question in 0653/22 May/June 2020

6 Which enzymes are secreted from the pancreas? 1 amylase 2 lipase 3 protease A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0653/21 Oct/Nov 2020

3 Some undigested food passes out of the digestive system as faeces. What is this process? A absorption B digestion C egestion D ingestion

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2020

3 Which row shows the results of mechanical digestion? food is broken down into smaller soluble smaller pieces molecules molecules \ \ «Ox < « x ae.

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2020

4 Protease breaks down protein. What is the protein broken down into? A amino acids B fatty acids C glycerol D starch

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2020

7 Which diagram represents the digestion of food molecules in the alimentary canal? A B C D

1 marks

Answer: A

This question in 0653/22 Feb/March 2021

5 Which description of mechanical digestion is correct? A breakdown of food into smaller pieces with chemical change to the food molecules B breakdown of food into smaller pieces without chemical change to the food molecules C breakdown of large insoluble food molecules into small soluble food molecules D breakdown of large soluble food molecules into small soluble food molecules

1 marks

Answer: B

This question in 0653/21 May/June 2021

6 Which part of the alimentary canal carries out digestion and absorption? A C B D

1 marks

Answer: B

This question in 0653/22 May/June 2021

6 Most food molecules need to be digested to allow them to be absorbed into the blood. Which row shows the type of digestion and the change needed to allow absorption to happen? type of digestion change to food molecules A chemical large molecules to small, insoluble molecules B chemical large molecules to small, soluble molecules C mechanical large molecules to small, soluble molecules D mechanical large molecules to small, insoluble molecules

1 marks

Answer: B

This question in 0653/23 May/June 2021

6 The following paragraph is a description of the digestion of fats. Large pieces of fat are broken down into smaller pieces of fat by ……1…… digestion. These smaller pieces of fat can then be broken down by the enzyme ……2…… . This is ……3…… digestion. During this process, the larger molecules are broken down into smaller, ……4…… molecules. Which row correctly completes gaps 1, 2, 3 and 4? 1 2 3 4 A chemical lipase mechanical soluble B chemical protease mechanical insoluble C mechanical lipase chemical soluble D mechanical protease chemical insoluble

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2021

7 The diagram shows part of the alimentary canal and associated structures. stomach bile duct X Which row correctly identifies structure X, an enzyme secreted by structure X and the action of this enzyme? structure X enzyme action of enzyme A liver amylase converts proteins to amino acids B pancreas amylase converts starch to simple sugars C liver protease converts proteins to amino acids D pancreas protease converts starch to simple sugars

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2021

6 Which type of digestion causes the breakdown of large, insoluble molecules into small, soluble molecules? A chemical B hormonal C mechanical D physical

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2021

5 Which row is correct for chemical digestion? food enzyme substances produced A fat protease fatty acids and glycerol B fat lipase amino acids C protein lipase fatty acids and glycerol D protein protease amino acids

1 marks

Answer: D

This question in 0653/22 Feb/March 2022

5 Which row is correct for a protease enzyme? where secreted molecule acted on end product A stomach protein amino acids B pancreas protein fatty acid and glycerol C stomach lipids amino acids D pancreas lipids fatty acid and glycerol

1 marks

Answer: A

This question in 0653/21 May/June 2022

5 Which row is correct for mechanical digestion? substance being broken down using product of breakdown broken down A large food molecules enzymes small pieces of food B large food molecules teeth small food molecules C large pieces of food enzymes small food molecules D large pieces of food teeth small pieces of food

1 marks

Answer: D

This question in 0653/22 May/June 2022

6 The diagram shows the digestion of fat. … 1 … glycerol … 2 … and … 3 … large piece small pieces of fat of fat Which row completes gaps 1, 2 and 3 in the diagram? 1 2 3 A chemical digestion chemical digestion amino acids B chemical digestion mechanical digestion fatty acids C mechanical digestion mechanical digestion amino acids D mechanical digestion chemical digestion fatty acids

1 marks

Answer: D

This question in 0653/23 May/June 2022

5 Which row correctly matches the type of digestion to its effect on the food particles? type of digestion makes smaller makes soluble A chemical no yes B chemical yes yes C mechanical no no D mechanical yes yes

1 marks

Answer: B

This question in 0653/21 Oct/Nov 2022

6 Where is amylase active in the alimentary canal? stomach small intestine v v 0 0O WwW > v x x v x x

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2022

4 The diagram shows some organs of the human body. 4 1 3 2 Which two structures carry out both mechanical and chemical digestion? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0653/22 Feb/March 2023

6 What is the purpose of chemical digestion? A to absorb minerals including calcium and iron B to pass food out as faeces C to break down large nutrient molecules into smaller molecules D to secrete enzymes

1 marks

Answer: C

This question in 0653/21 May/June 2023

6 The diagram shows what happens to fat in the alimentary canal. enzyme (2) large piece (1) (3) small (4) of fat molecules Which row correctly identifies 1, 2, 3 and 4? 1 2 3 4 A chemical lipase mechanical soluble digestion digestion B chemical protease ingestion insoluble digestion C mechanical lipase chemical soluble digestion digestion D mechanical protease ingestion insoluble digestion

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2023

5 The diagram shows starch being digested by amylase. starch amylase Which row shows the digestion taking place? chemical mechanical A x x B x v Cc v x D Jv v é % 00 *e $ é “ & ;

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2023

6 What is the role of mechanical digestion? A It breaks down large food molecules into smaller molecules. B It forms new chemical compounds for the body to utilise. C It breaks down large pieces of food into smaller pieces. D It makes the food particles soluble for better absorption.

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2023

2 The diagram shows a cross-section of a root hair cell. Which row describes the root hair cell and its function? animal cell or plant cell function A animal cell water and glucose absorption B animal cell water and ion absorption C plant cell water and glucose absorption D plant cell water and ion absorption

1 marks

Answer: D

This question in 0653/22 Feb/March 2024

6 The diagram shows the human alimentary canal and associated organs. Which organ can produce amylase, protease and lipase? A B D C

1 marks

Answer: C

This question in 0653/22 Feb/March 2024

2 The diagram represents the enzyme amylase and the products of digestion by amylase. amylase X Y What are products X and Y? X Y A amino acid amino acid B fatty acid glycerol C glycerol fatty acid D simple sugar simple sugar

1 marks

Answer: D

This question in 0653/21 May/June 2024

4 Which process produces food molecules that are small enough to be absorbed? A chemical digestion B egestion C ingestion D mechanical digestion

1 marks

Answer: A

This question in 0653/21 May/June 2024

6 Chemical digestion starts in the mouth and continues throughout the length of the alimentary canal. What is a sequence of three organs in the alimentary canal where chemical digestion occurs? A oesophagus  gall bladder  liver B oesophagus  stomach  small intestine C small intestine  gall bladder  large intestine D small intestine  stomach  oesophagus

1 marks

Answer: B

This question in 0653/22 May/June 2024

5 Chemical digestion produces small, soluble molecules. For which process is chemical digestion necessary? A absorption B egestion C excretion D ingestion

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2024

6 The diagram shows part of the human digestive system. stomach bile duct leading from gall bladder X Which row identifies structure X, an enzyme secreted by structure X and the action of this enzyme? structure X enzyme action of enzyme A liver amylase converts proteins to amino acids B pancreas amylase converts starch to simple sugars C liver protease converts proteins to amino acids D pancreas protease converts starch to simple sugars

1 marks

Answer: B

This question in 0653/22 Feb/March 2025

6 What is the purpose of physical digestion? A break down food into smaller pieces B break down insoluble food into soluble molecules C change food so that it can be absorbed into the blood D digest insoluble food molecules using enzymes

1 marks

Answer: A

This question in 0653/21 May/June 2025

8 Chemical digestion and physical digestion happen in various parts of the alimentary canal and associated organs. In which organ do both processes happen? A liver B mouth C oesophagus D pancreas

1 marks

Answer: B

This question in 0653/23 May/June 2025

9 A test-tube is used to model the effect of protease on a protein suspension in the stomach. test-tube protease and protein suspension at 37 °C What should be added to the test-tube to provide the optimum conditions for the digestion of protein? A amylase B bacteria C hydrochloric acid D lipase

1 marks

Answer: C

This question in 0653/23 May/June 2025

6 A person eats some bread which contains starch. Which row shows where the chemical digestion of the starch starts and finishes? starts finishes A mouth small intestine B mouth large intestine C stomach small intestine D stomach large intestine

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2025

7 Which description of physical digestion is correct? A the breakdown of food into smaller pieces with a chemical change to the food molecules B the breakdown of food into smaller pieces without a chemical change to the food molecules C the breakdown of large insoluble food molecules into small soluble food molecules D the breakdown of large soluble food molecules into small soluble food molecules

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2025

8 The diagram shows the alimentary canal and associated organs. Which structure has the correct name and function? A small intestine produces amylase B gall bladder produces protease C stomach kills bacteria D large intestine absorbs amino acids

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2025

6 Which statement about lipase is correct? A It is secreted into the colon and breaks down fats and oils. B It is secreted into the small intestine and breaks down fats and oils. C It is secreted into the small intestine and breaks down fatty acids into glycerol. D It is secreted into the stomach and breaks down glycerol into fatty acids.

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2025