Digestive System MCQs with Answers

Q1. The process of breaking down food into simpler substances is called:

a) Digestion

b) Absorption

c) Assimilation

d) Excretion

Answer: a) Digestion

Q2. The alimentary canal starts with the:

a) Mouth

b) Stomach

c) Small intestine

d) Large intestine

Answer: a) Mouth

Q3. The enzyme present in saliva that breaks down starch is:

a) Amylase

b) Lipase

c) Protease

d) Pepsin

Answer: a) Amylase

Q4. The muscular tube that connects the mouth to the stomach is called:

a) Esophagus

b) Trachea

c) Bronchus

d) Duodenum

Answer: a) Esophagus

Q5. The stomach secretes gastric juice, which contains:

a) Hydrochloric acid

b) Pepsin

c) Both a and b

d) None of the above

Answer: c) Both a and b

Q6. The enzyme pepsin digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: a) Proteins

Q7. The small intestine is divided into three parts: duodenum, jejunum, and:

a) Ileum

b) Colon

c) Rectum

d) Cecum

Answer: a) Ileum

Q8. The liver secretes bile, which is stored in the:

a) Gallbladder

b) Pancreas

c) Stomach

d) Small intestine

Answer: a) Gallbladder

Q9. Bile helps in the digestion of:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: c) Fats

Q10. The pancreas secretes pancreatic juice, which contains enzymes for digesting:

a) Proteins

b) Carbohydrates

c) Fats

d) All of the above

Answer: d) All of the above

Q11. The enzyme trypsin digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: a) Proteins

Q12. The enzyme lipase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: c) Fats

Q13. The enzyme amylase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: b) Carbohydrates

Q14. The absorption of nutrients mainly occurs in the:

a) Stomach

b) Small intestine

c) Large intestine

d) Esophagus

Answer: b) Small intestine

Q15. The large intestine is primarily involved in:

a) Digestion

b) Absorption of water

c) Secretion of enzymes

d) None of the above

Answer: b) Absorption of water

Q16. The final part of the large intestine is called the:

a) Rectum

b) Cecum

c) Colon

d) Ileum

Answer: a) Rectum

Q17. The process of removing undigested food from the body is called:

a) Digestion

b) Absorption

c) Assimilation

d) Excretion

Answer: d) Excretion

Q18. The enzyme maltase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: b) Carbohydrates

Q19. The enzyme sucrase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: b) Carbohydrates

Q20. The enzyme lactase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: b) Carbohydrates

Q21. The enzyme peptidase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: a) Proteins

Q22. The enzyme nucleotidase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Nucleic acids

Answer: d) Nucleic acids

Q23. The enzyme nuclease digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Nucleic acids

Answer: d) Nucleic acids

Q24. The enzyme enterokinase activates:

a) Trypsinogen

b) Pepsinogen

c) Both a and b

d) None of the above

Answer: a) Trypsinogen

Q25. The enzyme pepsinogen is activated by:

a) Hydrochloric acid

b) Enterokinase

c) Both a and b

d) None of the above

Answer: a) Hydrochloric acid

Q26. The enzyme trypsinogen is activated by:

a) Hydrochloric acid

b) Enterokinase

c) Both a and b

d) None of the above

Answer: b) Enterokinase

Q27. The enzyme chymotrypsinogen is activated by:

a) Hydrochloric acid

b) Enterokinase

c) Trypsin

d) None of the above

Answer: c) Trypsin

Q28. The enzyme carboxypeptidase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: a) Proteins

Q29. The enzyme aminopeptidase digests.

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: a) Proteins

Q30. The enzyme dipeptidase digests:

a) Proteins

b) Carbohydrates

c) Fats

d) Vitamins

Answer: a) Proteins

Q31. Enzyme lipase is secreted by:

a) Stomach

b) Pancreas

c) Liver

d) Small intestine

Answer: b) Pancreas

Q32. Enzyme amylase is secreted by:

a) Salivary glands

b) Pancreas

c) Both a and b

d) None of the above

Answer: c) Both a and b

Q33. Enzyme pepsin is secreted by:

a) Stomach

b) Pancreas

c) Liver

d) Small intestine

Answer: a) Stomach

Q34. Enzyme trypsin is secreted by:

a) Stomach

b) Pancreas

c) Liver

d) Small intestine

Answer: b) Pancreas

Q35. Enzyme chymotrypsin is secreted by:

a) Stomach

b) Pancreas

c) Liver

d) Small intestine

Answer: b) Pancreas

Q36. Enzyme carboxypeptidase is secreted by:

a) Stomach

b) Pancreas

c) Liver

d) Small intestine

Answer: b) Pancreas

Q37. Enzyme aminopeptidase is secreted by:

a) Stomach

b) Pancreas

c) Liver

d) Small intestine