O LevelBiologyCambridge (CIE)Exam Questions8. Human Nutrition8.2 Human Digestive System

Human Digestive System (Cambridge (CIE) O Level Biology): Exam Questions

Exam code: 5090

3 hours30 questions

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8.2 Human Digestive System

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1
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Which of the following is a correct function of bile?

  • To emulsify proteins

  • To neutralise the alkaline conditions of food entering the duodenum

  • To provide enzymes for the digestion of lipids

  • To increase the surface area of lipids for digestion

Choose your answer

2
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The diagram below shows four different types of human teeth.

 

7-q13-teeth

Which teeth would be used to grind and chew food?

  • 1 and 2

  • 1 and 3

  • 2 only

  • 2, 3 and 4

Choose your answer

3
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Which of the following is not an example of physical digestion?

  • Breaking food up into smaller pieces by chewing it.

  • Starch being broken down into glucose molecules.

  • Food being churned when the muscles in the stomach lining contracts.

  • Bile breaking large fat droplets up into smaller ones during emulsification.

Choose your answer

1
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The diagram below shows the organs of the digestive system.

7-q1-human

 

In which organs does the digestion of proteins take place?

  • W and Y

  • W and Z

  • Z only

  • W and X

Choose your answer

2
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Which of the following descriptions are correctly matched to the different stages of food breakdown?

 

absorption

assimilation

egestion

A

small soluble food molecules move into the bloodstream

small soluble food molecules cross the cell membrane of cells

excretion of undigested or unabsorbed food through the anus

B

small soluble food molecules move into the bloodstream

small soluble food molecules cross the cell membrane of cells

passing out of undigested or unabsorbed food through the anus

C

small soluble food molecules cross the cell membrane of cells

small soluble food molecules move into the bloodstream

passing out of undigested or unabsorbed food through the anus

D

small soluble food molecules cross the cell membrane of cells

small soluble food molecules move into the bloodstream

excretion of undigested or unabsorbed food through the anus

    Choose your answer

    31 mark

    The diagram shows part of the human alimentary canal and associated organs.

    q3-8-2-human-digestive-system-medium-mcq-cie-o-level-biology-2

    Which row describes the functions of parts shown in the diagram?

     

    structure

    function

    structure

    function

    A

    1

    digestion of protein

    3

    absorption of the products of digestion

    B

    2

    emulsifying fats

    3

    absorption of amino acids and glucose

    C

    4

    production of bile

    5

    making digestive enzymes

    D

    5

    storing digestive enzymes

    2

    making digestive enzymes

     

      Choose your answer

      1
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      A student ate a meal which contained a type of biomolecule, X.

      The digestion of biomolecule X started in the mouth, and finished in the duodenum.

      What is the product of the digestion of biomolecule X?

      • Amino acids

      • Protein

      • Glucose

      • Starch

      Choose your answer

      2
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      Below is a list of chemical reactions that occur during digestion.

      1. Protein → amino acids

      2. Starch → maltose

      3. Lipids → fatty acids + glycerol

      4. Maltose → glucose

      Which of the chemical reactions above might occur in the duodenum?

      • 1, 3 and 4

      • 4 only

      • 2, 3 and 4

      • All 4

      Choose your answer

      3
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      Which of the following shows the correct role of a substance made during digestion?

       

      substance

      made by

      effect

      A

      trypsin

      stomach

      digests proteins into amino acids

      B

      bile

      gallbladder

      neutralising acidic mixture of food entering the duodenum from the stomach

      C

      gastric juice

      stomach

      denaturing enzymes in harmful microorganisms and optimising pH for pepsin activity

      D

      bile

       liver

      neutralising alkaline mixture of food entering the duodenum from the stomach

        Choose your answer

        4
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        The diagram below shows the activity of salivary amylase on a starch molecule.

        7-q12-starch

         

        Which of the following is not a function of salivary amylase?

        • Increasing the rate of breakdown of starch molecules

        • Increasing the rate of starch breakdown into maltose molecules

        • Breaking a large insoluble molecule into smaller soluble molecules

        • Increasing the rate of starch breakdown into glucose molecules

        Choose your answer

        5
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        The diagram below shows the organs of the digestive system, including the alimentary canal and accessory organs.

        picture5

        Where are most of the digestive lipase enzymes made in the body?

        • 2 only

        • 4 only

        • 3 and 4

        • 1 and 4

        Choose your answer