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Quiz Chapter 9: Nutrition and the Human Digestive System

10 questions · Form 4 Biology Bab 9: Nutrition and the Human Digestive System

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which hormone causes the liver to convert excess blood glucose into glycogen during assimilation?

  1. A. Glucagon
  2. B. Insulin
  3. C. Adrenaline
  4. D. Thyroxine
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Answer: B

Insulin secreted by the pancreas stimulates liver cells to convert glucose into stored glycogen.

2. Which enzyme converts sucrose into one molecule of glucose and one molecule of fructose in the ileum?

  1. A. Maltase
  2. B. Lactase
  3. C. Sucrase
  4. D. Lipase
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Answer: C

Sucrase hydrolyzes sucrose into glucose and fructose in the small intestine.

3. Which list contains ONLY pancreatic enzymes secreted into the duodenum?

  1. A. Pepsin, Rennet, Sucrase
  2. B. Pancreatic amylase, Trypsin, Pancreatic lipase
  3. C. Maltase, Lactase, Erepsin
  4. D. Salivary amylase, Bile, Gastrin
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Answer: B

Pancreatic juice contains pancreatic amylase (starches), trypsin (proteins), and pancreatic lipase (fats).

4. What is the primary site for the final chemical digestion of disaccharides into monosaccharides in humans?

  1. A. Mouth
  2. B. Stomach
  3. C. Ileum (Small Intestine)
  4. D. Colon
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Answer: C

Enzymes embedded in the microvilli membrane of the ileum (maltase, sucrase, lactase) complete carbohydrate digestion into monosaccharides.

5. Which of the following describes physical digestion?

  1. A. Hydrolysis of starch into maltose by salivary amylase
  2. B. Emulsification of large fat globules into tiny droplets by bile salts
  3. C. Breakdown of polypeptides into peptides by trypsin
  4. D. Conversion of maltose into glucose by maltase
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Answer: B

Emulsification by bile breaks large fat drops into smaller droplets without altering their chemical bonds, which is a physical digestion process.

6. What instrument is used in laboratory settings to measure the total energy content of a dried food sample?

  1. A. Potometer
  2. B. Bomb calorimeter
  3. C. Respirometer
  4. D. Sphygmomanometer
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Answer: B

A bomb calorimeter measures the heat energy released when a known mass of food is completely combusted in pure oxygen.

7. Fat-soluble vitamins (A, D, E, K) and fatty acids are absorbed into which specific vessel inside a villus?

  1. A. Blood capillary
  2. B. Lacteal
  3. C. Hepatic artery
  4. D. Venule
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Answer: B

Fat-soluble substances enter the central lymphatic vessel of the villus, known as the lacteal.

8. How are water-soluble nutrients such as glucose and amino acids transported from the small intestine to the liver?

  1. A. Via lacteals into the thoracic duct
  2. B. Via blood capillaries into the hepatic portal vein
  3. C. Via lymphatic vessels into the subclavian vein
  4. D. Via pulmonary arteries directly to the heart
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Answer: B

Water-soluble nutrients absorb into capillaries of villi and travel directly to the liver through the hepatic portal vein.

9. Which rhythmic muscular contraction moves food along the entire length of the alimentary canal?

  1. A. Mastication
  2. B. Peristalsis
  3. C. Assimilation
  4. D. Emulsification
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Answer: B

Peristalsis is the alternating contraction and relaxation of longitudinal and circular muscles that propels food through the digestive tract.

10. Which end product of lipid digestion enters the lymphatic system after passing through epithelial cells of the villus?

  1. A. Glucose droplets
  2. B. Chylomicrons / Recombined lipid droplets
  3. C. Polypeptide chains
  4. D. Soluble starch
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Answer: B

Fatty acids and glycerol recombine inside villus epithelial cells into microscopic lipid droplets (chylomicrons) that enter lacteals.

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