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Chapter 4 Practice Paper: Nutrition in Humans — question paper

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QQ/S3BI/CH4

Secondary 3 · Biology (G2 / G3)

Chapter 4 Practice Paper

Nutrition in Humans

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is 30.

Original practice material written for the MOE Biology syllabus. It is not an official MOE or school examination paper. Parts and functions of the digestive system, peristalsis, digestive enzymes and their substrates and products, villus absorption, the hepatic portal vein, liver functions and the effects of alcohol.

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Which organ both stores food and begins protein digestion?

    1. Athe mouth
    2. Bthe oesophagus
    3. Cthe stomach
    4. Dthe colon
    ( )
  2. 2

    Peristalsis can be described as

    1. Athe release of enzymes from the pancreas
    2. Brhythmic wave-like contractions of muscle that push food along the canal
    3. Cthe absorption of water in the large intestine
    4. Dthe churning of food by the stomach walls only
    ( )
  3. 3

    Which enzyme digests starch to maltose?

    1. Alipase
    2. Bprotease
    3. Cmaltase
    4. Damylase
    ( )
  4. 4

    The products of fat digestion are absorbed mainly into

    1. Athe hepatic portal vein directly
    2. Bthe lacteal of each villus
    3. Cthe stomach wall
    4. Dthe colon
    ( )
  5. 5

    Blood leaving the small intestine travels first to the liver through the

    1. Ahepatic portal vein
    2. Bhepatic vein
    3. Caorta
    4. Dpulmonary artery
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    Complete the table about digestive enzymes by naming the missing enzyme, substrate or end-product.

    Digestive enzymes (rows a–c)

    EnzymeSubstrateEnd-product(s)
    (a) ................starchmaltose
    maltase(b) ................glucose
    lipasefats(c) ................
    1. (a)

      Name the enzyme that digests starch to maltose and state where it is made.

      [2]
    2. (b)

      Name maltase’s substrate.

      [1]
    3. (c)

      Name the end-products of lipase digestion, and the substance that must emulsify fats first for lipase to work efficiently.

      [3]
  2. 2

    A villus in the ileum is described as a finger-like fold, one cell thick, with a network of blood capillaries and a central lacteal.

    1. (a)

      Explain how the one-cell-thick epithelium and the finger-like shape help absorption.

      [2]
    2. (b)

      Name the vessel that absorbs glucose and the vessel that absorbs fats, and state one difference in where their contents travel next.

      [3]
    3. (c)

      State two roles of the liver once the absorbed nutrients arrive.

      [2]
  3. 3

    A driver’s reaction time is tested before and after consuming alcohol. The table shows the results.

    Reaction time after alcohol

    Drinks consumedReaction time / s
    00.25
    20.30
    40.40
    1. (a)

      Calculate the percentage increase in reaction time from 0 to 4 drinks.

      increase =%[2]
    2. (b)

      Explain how alcohol produces this change in the brain.

      [2]
    3. (c)

      State one social consequence of drinking and driving, and one long-term effect of heavy alcohol use on the liver.

      [3]

— End of paper —