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Chapter 4 Practice Paper: Nutrition in Humans — question paper

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QQ/S3CBI/CH4

Secondary 3 · Combined Science (Biology) (G2 / G3)

Chapter 4 Practice Paper

Nutrition in Humans

Duration: 40 minutes
Total: 30 marks
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • Biological drawings are not required; describe or label structures in words where asked.
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Biology) syllabus. It is not an official MOE or school examination paper. Chapter 4 (digestive organs and processes; amylase, maltase, protease, lipase; hepatic portal vein; liver roles; insulin and glucagon; type 2 diabetes).

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

    Starch —amylase→ X —maltase→ glucose. What is X?

    1. Aglycogen
    2. Bamino acids
    3. Cmaltose
    4. Dfatty acids
    ( )
  2. 2

    The hepatic portal vein transports blood rich in absorbed nutrients

    1. Afrom the liver to the heart
    2. Bfrom the small intestine to the liver
    3. Cfrom the stomach to the kidney
    4. Dfrom the liver to the small intestine
    ( )
  3. 3

    Which organ both stores glucose as glycogen and makes bile?

    1. Apancreas
    2. Bsmall intestine
    3. Cstomach
    4. Dliver
    ( )
  4. 4

    After a long fast, blood glucose is low. Which correction follows?

    1. Ainsulin released; glucose → glycogen
    2. Bglucagon released; glycogen → glucose
    3. Cinsulin released; glycogen → glucose
    4. Dglucagon released; glucose → glycogen
    ( )
  5. 5

    A hormone can be described as

    1. Aa nerve signal crossing a synapse
    2. Ban enzyme secreted into the gut
    3. Ca chemical from a gland, carried by blood, acting on target organs
    4. Dany substance absorbed from food
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    The human digestive system is a dismantling line running from mouth to anus.

    1. (a)

      Name the organ where most absorption of food end-products takes place.

      [1]
    2. (b)

      Name the process by which undigested material leaves the body, and the organ involved.

      [2]
    3. (c)

      Describe the roles of the stomach and of the large intestine in digestion.

      [2]
    4. (d)

      Assimilation happens after absorption. State what it means, using glucose as your example.

      [2]
  2. 2

    A patient)s blood glucose was measured after a standard sugary drink.

    Blood glucose after a glucose drink

    Time / hoursPatient P / mmol per dm³Patient Q / mmol per dm³
    05.05.2
    18.012.0
    26.512.1
    35.011.8
    1. (a)

      Calculate how fast P's glucose fell between 1 and 3 hours.

      rate =mmol per dm³ per hour[2]
    2. (b)

      Name the hormone responsible for P's fall and describe the liver)s response.

      [2]
    3. (c)

      Patient Q's glucose stays above 11 mmol per dm³. State the condition this suggests and explain what is going wrong.

      [3]
  3. 3

    The liver is the first organ to receive absorbed food.

    1. (a)

      Name the blood vessel that makes this true.

      [1]
    2. (b)

      Describe two liver roles, other than glucose storage.

      [4]
    3. (c)

      State why the liver)s position "first in line" benefits the body.

      [1]

— End of paper —