Biology 5090 · O Level
Human digestive system
50 practice questions on Human digestive system, with worked solutions and instant marking.
The diagram illustrates a section of the alimentary canal together with linked structures. Which organs are P and Q?
May/June 2016
Which statement concerning chemical digestion in the human alimentary canal is correct?
May/June 2016
The diagram illustrates a section of the alimentary canal together with associated organs. Which row gives the correct description of the functions of the parts shown in the diagram?
May/June 2016
A person has an obstruction in their bile duct. What would be the consequence of this?
May/June 2017
Which is not one of the liver's functions?
May/June 2017
The diagram illustrates the human alimentary canal. In which part does protein digestion start?
May/June 2017
The stages of human nutrition listed here are: ingestion, digestion, absorption, egestion. Fig. 2.1 displays the human alimentary canal.
May/June 2017
At which point does bile enter the alimentary canal?
May/June 2018
The diagram shows a structure that is part of the wall of the alimentary canal. In what section of the alimentary canal can this structure be found?
May/June 2018
Explain why most food consumed by a human needs to be digested.
May/June 2018
Which statement best explains the function of the stomach?
May/June 2019
The diagram illustrates how the human teeth are arranged in the lower jaw. Which tooth is an incisor?
May/June 2019
The lengths of three sections of the human alimentary canal are given below. Section P: $350\,\text{cm}$ Section Q: $150\,\text{cm}$ Section R: $26\,\text{cm}$ Which row names these sections correctly?
May/June 2019
A surgical procedure is used to remove the gall bladder. What are patients who have had this procedure unable to do?
May/June 2019
The diagram illustrates part of the human alimentary canal and the organs connected with it. Which row describes the functions of the parts shown in the diagram?
May/June 2021
The diagram illustrates part of the human alimentary canal and related organs. Which row gives the functions of the parts shown in the diagram?
May/June 2021
The diagram illustrates part of the human alimentary canal together with its associated organs.
May/June 2021
Sometimes gall bladders become infected and must be removed by surgery. How would this affect the functioning of the body?
May/June 2022
The diagram shows food in a section of the small intestine.
May/June 2022
A student says: ‘When circular muscles contract, the contents are driven onwards.’ Which process is this describing?
May/June 2023
Four organs of the alimentary canal are named: J colon, K duodenum, L oesophagus, M stomach. Which sequence shows the route food takes through these organs?
May/June 2023
The diagram illustrates some parts of the human digestive system. Which row states the main function of each labelled part?
May/June 2024
Scientists estimated the surface areas of the internal walls of several parts of a healthy human digestive system. Which region is the small intestine?
May/June 2024
The diagram illustrates the human digestive system. Which row correctly gives the functions of the parts labelled in the diagram?
May/June 2025
Which substances take part in the emulsification and digestion of vegetable oil in the digestive system?
May/June 2025
Fig. 3.1 illustrates the human digestive system. Fig. 3.2 illustrates a cross-section through organ E in a healthy person and in a person with coeliac disease.
May/June 2025
Which digestive processes occur in the mouth (buccal cavity)?
Oct/Nov 2015
Every region of the alimentary canal has the pH that is most suitable for the enzymes digesting food there. What is the optimum pH for an enzyme that operates in the stomach?
Oct/Nov 2015
Explain why the majority of foods need digestion.
Oct/Nov 2015
Describe the digestive processes occurring in the human mouth (buccal cavity).
Oct/Nov 2015
Which function is not performed by the liver?
Oct/Nov 2016
Starch digestion takes place in the mouth cavity and in the duodenum, but it does not continue in the stomach. Why does this happen?
Oct/Nov 2016
The diagram illustrates the alimentary canal and some of the organs linked to it. Which row indicates the place where amylase is secreted?
Oct/Nov 2016
After food is eaten, the pH in the mouth falls. Which statement explains this fall?
Oct/Nov 2017
Fig. 1.1 illustrates four kinds of human teeth, A, B, C and D. Fig. 1.2 below illustrates how the teeth are arranged in the lower jaw of a human.
Oct/Nov 2017
What is the colon’s main function?
Oct/Nov 2018
A gland releases various enzymes into one section of the alimentary canal, where proteins and starch are digested. This section also receives alkaline secretions from a different gland and has muscles responsible for peristalsis. Which part of the alimentary canal is this?
Oct/Nov 2018
The diagram depicts a section of the alimentary canal together with the linked organs.
Oct/Nov 2018
In which part of the body do both the physical and chemical breakdown of food take place?
Oct/Nov 2019
The diagram illustrates the human alimentary canal. In which section does protein digestion start?
Oct/Nov 2020
The diagram shows how the human alimentary canal would appear if it were taken out of a person and then laid out straight.
Oct/Nov 2020
Which statement correctly describes chemical digestion in the human alimentary canal?
Oct/Nov 2021
Which statement concerning chemical digestion in the human alimentary canal is correct?
Oct/Nov 2021
Which function is not one of the jobs carried out by the liver?
Oct/Nov 2022
The diagram illustrates the processing of food in the human alimentary canal. Which row correctly names the stages?
Oct/Nov 2022
The diagram illustrates the human digestive system. At which parts do ingestion and egestion take place?
Oct/Nov 2023
Which organ makes an acid that destroys bacteria in food that has been eaten?
Oct/Nov 2023
Fig. 5.1 shows two structures that are part of the human digestive system.
Oct/Nov 2023
The diagram illustrates part of the human digestive system. Which parts make bile and store bile?
Oct/Nov 2024
Fig. 3.1 summarises protein metabolism in the body. Diagram text: 'protein broken down in the stomach by enzyme A'; 'protein broken down in the small intestine by enzyme B'; 'amino acids absorbed into the bloodstream'; 'blood vessel C'; 'surplus amino acids changed into urea in the liver'; 'urea removed from the blood in the kidney and excreted'. Table 3.1 gives the results of an investigation. Group X ate bread, jam, orange juice, lettuce, fruit. Group Y ate nuts, milk, bread, cheese, meat. Early the next morning, urine was tested for urea concentration.
Oct/Nov 2025