O LevelBiologyCambridgeExam Questions8. Human Nutrition8.2 Human Digestive System

Human Digestive System (Cambridge O Level Biology)

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8.2 Human Digestive System

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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

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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

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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.

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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

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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

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    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

     

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      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

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      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

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      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

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        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

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        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

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