arrow_backBack to Study Resources

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. 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
Show answer

Answer: B

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

2. Which organ produces bile, and where is it stored prior to release into the duodenum?

  1. A. Produced in gallbladder, stored in liver
  2. B. Produced in liver, stored in gallbladder
  3. C. Produced in pancreas, stored in liver
  4. D. Produced in stomach, stored in duodenum
Show answer

Answer: B

Bile is synthesized by liver cells and concentrated/stored in the gallbladder.

3. Which vitamin is synthesized by symbiotic bacteria (such as Escherichia coli) living in the human large intestine?

  1. A. Vitamin C
  2. B. Vitamin D
  3. C. Vitamin K
  4. D. Vitamin A
Show answer

Answer: C

Intestinal microbiota synthesize important micronutrients, notably Vitamin K and certain B vitamins.

4. 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
Show answer

Answer: B

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

5. 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
Show answer

Answer: B

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

6. 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
Show answer

Answer: B

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

7. 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
Show answer

Answer: B

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

8. What is the role of hydrochloric acid in the stomach regarding enzyme activity?

  1. A. It denatures pepsin.
  2. B. It activates inactive pepsinogen into active pepsin.
  3. C. It neutralizes pancreatic juice.
  4. D. It breaks down lipids into fatty acids.
Show answer

Answer: B

Hydrochloric acid provides an acidic medium and converts the zymogen precursor pepsinogen into active pepsin.

9. Why is dietary fiber (cellulose) an essential component of a balanced human diet, even though humans cannot digest it?

  1. A. It provides essential amino acids.
  2. B. It stimulates peristalsis and prevents constipation.
  3. C. It yields 38 ATP per gram.
  4. D. It dissolves fat-soluble vitamins.
Show answer

Answer: B

Dietary fiber adds bulk to intestinal contents, retaining water and facilitating smooth peristaltic movements to prevent constipation.

10. A patient experiences pain in the stomach lining due to erosion caused by excessive hydrochloric acid secretion. What condition does this describe?

  1. A. Appendicitis
  2. B. Gastritis
  3. C. Anorexia nervosa
  4. D. Bulimia nervosa
Show answer

Answer: B

Gastritis is inflammation and irritation of the stomach mucosal lining, often aggravated by irregular meals or excess acid.

Sponsored