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O Level Biology: Human Nutrition MCQs — Biology (page 2)

32 multiple-choice questions on O Level Biology: Human Nutrition from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. Assimilation is

  1. the absorption of water
  2. the removal of faeces
  3. the uptake and use of nutrients by cells
  4. breaking down food

Answer: C) the uptake and use of nutrients by cells

Explanation: Cells use absorbed nutrients. O Level Biology · Topic 8 Human Nutrition · 8.3 Absorption and assimilation

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27. Iron is needed to make

  1. enzymes in saliva
  2. haemoglobin
  3. bile
  4. bones

Answer: B) haemoglobin

Explanation: Iron is part of haemoglobin. O Level Biology · Topic 8 Human Nutrition · 8.1 Diet

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28. Which organ secretes amylase, protease and lipase into the duodenum?

  1. Liver
  2. Pancreas
  3. Stomach
  4. Gall bladder

Answer: B) Pancreas

Explanation: Pancreatic juice contains all three. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system

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29. Where are most nutrients absorbed?

  1. Small intestine (ileum)
  2. Oesophagus
  3. Colon
  4. Stomach

Answer: A) Small intestine (ileum)

Explanation: The ileum is adapted for absorption. O Level Biology · Topic 8 Human Nutrition · 8.3 Absorption and assimilation

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30. Which vessel carries absorbed glucose from the ileum to the liver?

  1. Pulmonary vein
  2. Hepatic artery
  3. Hepatic portal vein
  4. Renal vein

Answer: C) Hepatic portal vein

Explanation: The hepatic portal vein links gut and liver. O Level Biology · Topic 8 Human Nutrition · 8.3 Absorption and assimilation

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31. Most water is absorbed in the

  1. small intestine
  2. colon
  3. stomach
  4. rectum

Answer: A) small intestine

Explanation: Most water is absorbed in the small intestine; some in the colon. O Level Biology · Topic 8 Human Nutrition · 8.3 Absorption and assimilation

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32. Bile helps digestion by

  1. absorbing water
  2. making the stomach acidic
  3. emulsifying fats to increase surface area
  4. digesting proteins

Answer: C) emulsifying fats to increase surface area

Explanation: Bile breaks fat into small droplets. O Level Biology · Topic 8 Human Nutrition · 8.2 Human digestive system

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