Biology 0610 · IGCSE
Chemical digestion
97 practice questions on Chemical digestion, with worked solutions and instant marking.
The diagram illustrates part of the alimentary canal and the related organs. Which structures release enzymes that break down proteins?
Feb/March 2016
The diagram illustrates a large food molecule being broken down into smaller molecules. What is process X?
Feb/March 2016
The diagram illustrates part of the alimentary canal and the organs linked to it. Which structures produce enzymes that break down proteins?
Feb/March 2016
The diagram illustrates a large food molecule being broken down into smaller molecules. What is process X?
Feb/March 2016
The boxes on the left show the names of glands that release enzymes. The boxes on the right list the digestive enzymes. A few glands make more than one enzyme.
Feb/March 2017
Table 6.1 presents several enzymes together with their substrates, products and the parts of the digestive system where they are formed.
Feb/March 2017
Define what chemical digestion means.
Feb/March 2018
What does the term chemical digestion mean?
Feb/March 2019
What is the meaning of chemical digestion?
Feb/March 2019
The graph illustrates the concentration of maltose in various regions of the alimentary canal. What is responsible for the change in concentration at $X$?
Feb/March 2019
Which food group is chemically digested in the mouth, moves on through the stomach and is then further broken down by chemical digestion in the small intestine?
Feb/March 2020
A learner examined how starch is digested. Fig. 2.1 shows the apparatus she used. Dialysis tubing is used as a model of a cell membrane. The dialysis tubing material lets small molecules pass through it, but not larger molecules. Test-tubes A and B were arranged as shown in Fig. 2.1 and kept in a water-bath at 37 ^{\circ}C for 30 minutes. The liquid outside the dialysis tubing in test-tubes A and B was checked with Benedict’s solution at 0 minutes and again after 30 minutes. Table 2.1 gives the results.
Feb/March 2023
What is meant by chemical digestion?
Feb/March 2024
In which section of the alimentary canal does hydrochloric acid create an acidic pH for enzymes?
Feb/March 2024
Which food group is chemically digested in the mouth, moves through the stomach and is then further chemically digested in the small intestine?
Feb/March 2024
What functions does the hydrochloric acid in gastric juice perform?
Feb/March 2025
The diagram illustrates several organs of the human body. In which organs does the digestion of proteins occur?
May/June 2016
Which organ is responsible for producing amylase?
May/June 2016
In what part of the alimentary canal is maltose digested?
May/June 2016
What roles does the hydrochloric acid in gastric juice play?
May/June 2017
The graph illustrates how pH affects the activity of three separate enzymes. The table gives the pH values of different sections of the alimentary canal: mouth pH $7.0$, stomach pH $2.0$, small intestine pH $8.5$. Which enzymes shown in the graph are most likely to be protease enzymes?
May/June 2017
Fig. 8.1 presents a diagram of the alimentary canal.
May/June 2017
Fig. 2.1 shows the alimentary canal in diagram form.
May/June 2017
This question concerns chemical digestion.
May/June 2017
Fat is an essential component of the human diet. The arrows in Fig. 1.1 indicate the route followed by fat through part of the alimentary canal.
May/June 2017
During digestion, enzymes break down different foods into smaller substances that can be absorbed.
May/June 2018
State the names for A to D in Fig. 1.1.
May/June 2018
The diagram illustrates the human alimentary canal. Which two structures both secrete digestive enzymes?
May/June 2019
A person consumes some cheese that has a large amount of fats and protein. Which row gives the combination of substances that will break down the cheese most effectively?
May/June 2019
The diagram illustrates the human alimentary canal. Which pair of structures each produce digestive enzymes?
May/June 2019
The digestion of starch in food takes place in two stages. In which sections of the alimentary canal do these two stages happen?
May/June 2019
Fig. 6.1 shows a photomicrograph of part of a pancreatic cell that makes enzymes which are secreted into the small intestine. The parts are labelled P, Q, R and S. The magnification is \times20000.
May/June 2019
What substances are produced when proteins are broken down?
May/June 2021
Which option correctly names the enzyme and the products formed during fat digestion?
May/June 2021
Which substances are produced when proteins are broken down?
May/June 2021
What is one function of water in digestion?
May/June 2023
In which part of the alimentary canal is maltose digested?
May/June 2023
State what is meant by the term chemical digestion.
May/June 2023
Fill in the enzyme sentences by entering an appropriate word or phrase in each blank. Enzymes take part in chemical digestion, producing small [BLANK] molecules that can pass into the blood. Two protease enzymes are pepsin and trypsin. Pepsin is made by the [BLANK] and works best in acidic conditions. Such conditions are produced by the secretion of [BLANK], which gives the optimum pH for pepsin activity and also destroys harmful [BLANK]. The [BLANK] makes trypsin, which digests protein in [BLANK] pH conditions. These conditions are produced by a substance called [BLANK], which neutralises gastric juices and also plays a key part in the [BLANK] of fats and oils.
May/June 2023
A person consumed food X. Chemical digestion of food X took place in the mouth and small intestine, but not in the stomach. What was food X?
May/June 2024
What substance is formed when lipase acts on fats?
May/June 2024
The diagrams illustrate carbohydrate molecules as they move through the alimentary canal. Which row shows the molecules accurately?
May/June 2024
Which row gives the correct information about three digestive enzymes in humans?
May/June 2024
Which substance results from protein digestion?
May/June 2024
Amylase is produced by which organ?
May/June 2024
Which row identifies an enzyme together with the correct place where it is produced and the products formed during digestion?
May/June 2025
The diagram illustrates part of the human digestive system. At which location does amylase act on food?
May/June 2025
Which row gives the correct information about an enzyme in the alimentary canal?
May/June 2025
What role does trypsin play in digestion?
May/June 2025
The diagram illustrates a section of the human digestive system. In which region does protein digestion start?
May/June 2025
Fig. 1.1 is a diagram showing the human digestive system. Table 1.1 gives information about some of the structures in Fig. 1.1. Use Fig. 1.1 to complete Table 1.1.
May/June 2025
The diagram depicts part of the human alimentary canal and the organs linked to it. In which part does amylase act on food?
Oct/Nov 2016
The graph shows how pH affects the activity of a human digestive enzyme. Which enzyme is it?
Oct/Nov 2016
The diagram illustrates part of the human alimentary canal. Which organ secretes hydrochloric acid?
Oct/Nov 2016
Which chemical reaction occurs in the mouth?
Oct/Nov 2017
Into which section of the alimentary canal is the enzyme that breaks down starch released?
Oct/Nov 2017
In which part of the alimentary canal is the enzyme trypsin located, and what products are formed in the reaction it catalyses?
Oct/Nov 2017
Into which part of the alimentary canal is the enzyme responsible for starch digestion secreted?
Oct/Nov 2017
The set-up illustrated is being used in an investigation into starch digestion. Which test-tube will contain the greatest amount of sugar after 20 minutes?
Oct/Nov 2018
The diagram shows part of the alimentary canal. Which structure secretes lipase?
Oct/Nov 2018
The apparatus illustrated is being used to carry out an experiment on starch digestion. After 20 minutes, which test-tube has the greatest amount of sugar?
Oct/Nov 2018
In which row are the site of production and the products of an enzyme shown correctly?
Oct/Nov 2018
The diagram illustrates a section of the alimentary canal. Which structure makes lipase?
Oct/Nov 2018
The apparatus illustrated is being used for an experiment on starch digestion. Which test-tube has the greatest amount of sugar after 20 minutes?
Oct/Nov 2018
The apparatus illustrated is being used in an investigation of starch digestion. Which test tube will have the greatest amount of sugar after 20 minutes?
Oct/Nov 2018
Which organ is responsible for amylase secretion?
Oct/Nov 2019
Use the words in the list to complete the sentences about food and digestion. Each word can be used once, more than once, or not used at all. absorbed, antibodies, bacteria, duodenum, egested, enzymes, fat, stomach, water
Oct/Nov 2019
Gastric juice is released by cells in the stomach lining, and it contains hydrochloric acid and pepsin.
Oct/Nov 2019
The diagram illustrates a large food molecule changing into smaller molecules. What is process X?
Oct/Nov 2021
The diagram illustrates a large food molecule being broken down into smaller molecules. What is process X?
Oct/Nov 2021
The diagram illustrates a large food molecule being broken down into smaller molecules. What process is X?
Oct/Nov 2021
The diagram illustrates a large food molecule being broken down into smaller molecules. What is process X?
Oct/Nov 2021
The diagram depicts a large food molecule being broken down into smaller molecules. What is process X?
Oct/Nov 2021
Which section of the alimentary canal makes an enzyme that breaks down proteins?
Oct/Nov 2021
The diagram illustrates a large food molecule being broken down into smaller molecules. What is process X?
Oct/Nov 2021
In humans, enzymes are made by different parts of the alimentary canal and assist with food digestion.
Oct/Nov 2021
Which process gives an organism the raw materials necessary for tissue repair?
Oct/Nov 2022
The graph illustrates the concentration of maltose in various regions of the alimentary canal. What is responsible for the change in concentration at X?
Oct/Nov 2022
The graph illustrates the concentration of maltose in different regions of the alimentary canal. What causes the change in concentration at X?
Oct/Nov 2022
The graph displays the concentration of maltose in different regions of the alimentary canal. What causes the change in concentration at X?
Oct/Nov 2022
Digestive enzymes speed up the breakdown of large insoluble molecules.
Oct/Nov 2022
Digestive enzymes are released into the alimentary canal.
Oct/Nov 2022
What does the term chemical digestion mean?
Oct/Nov 2023
Some medicines are formed into tablets and then covered with a substance that is similar to starch. This covering shields the medicine from the action of gastric juice. Which enzyme breaks down the covering, and what is formed as a result of this?
Oct/Nov 2023
What does the term chemical digestion mean?
Oct/Nov 2023
Certain medicines are formed into tablets and covered with a starch-like layer. This layer shields the medicine from the action of gastric juice. Which enzyme breaks down the coating, and what is formed as a result of this process?
Oct/Nov 2023
A diagram is shown of part of the human digestive system. Which organ is responsible for producing hydrochloric acid?
Oct/Nov 2023
The diagram illustrates the human digestive system. Which letters indicate the places where amylase works during digestion?
Oct/Nov 2024
What substances result from protein digestion in the stomach?
Oct/Nov 2024
Which statement about enzymes involved in digestion is correct?
Oct/Nov 2024
Which row gives the correct enzyme, its substrate and the place where the enzyme acts in the alimentary canal?
Oct/Nov 2024
The graphs illustrate how pH affects the activity of four different digestive enzymes. Which enzyme has the highest activity in the stomach?
Oct/Nov 2025
What is one function of bile?
Oct/Nov 2025
At which part of the alimentary canal is the enzyme trypsin present, and what products are formed by the reaction that trypsin catalyses?
Oct/Nov 2025
Which function takes place in the duodenum?
Oct/Nov 2025
Give one example of chemical digestion.
Oct/Nov 2025
The diagrams illustrate the same mass of oil at the same temperature, but split into drops of different sizes. In which pairing of oil drop size and enzyme will the oil be digested most quickly?
Oct/Nov 2025