Biology Digestion Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Biology Digestion Question and Answer

Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Biology Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Biology Interview Question Answer Universities Entrance Test

Biology Digestion Practice Test Online With Explanation

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1. Which of these organs detoxifies harmful substances in the body?

Stomach

Liver

Pancreas

Kidney

2. What is the function of the enzyme maltase?

Breaks down lipids

Emulsifies fats

Converts maltose into glucose

Converts proteins into peptides

3. What are the finger-like projections in the small intestine called?

Villi

Rugae

Microvilli

Alveoli

4. Which enzyme is responsible for protein digestion in the small intestine?

Trypsin

Amylase

Lipase

Pepsin

5. Which gland produces saliva?

Parotid

Thyroid

Adrenal

Pituitary

6. What is the role of the enzyme sucrase?

Emulsifies fat

Breaks down starch

Breaks down protein

Converts sucrose into glucose and fructose

7. What causes the acidic pH in the stomach?

Gastric mucus

Sodium bicarbonate

Hydrochloric acid

Bile

8. Which of the following nutrients is digested mainly by enzymes from the pancreas?

Vitamins

Fiber

Water

Fats

9. What type of gland is the pancreas in terms of digestion?

Exocrine gland only

Both endocrine and exocrine

Endocrine gland only

Digestive organ only

10. What is the role of mucus in the digestive tract?

Absorbs nutrients

Lubricates and protects the lining

Breaks down food

Neutralizes acid

11. Which enzyme is secreted by the pancreas to digest proteins?

Trypsin

Pepsin

Maltase

Amylase

12. What is the name of the semi-liquid mixture of food and digestive juices in the stomach?

Chyme

Bile

Mucus

Feces

13. Which nutrient is absorbed into lacteals in the villi?

Amino acids

Vitamins

Glucose

Fatty acids

14. What is the end product of carbohydrate digestion?

Amino acids

Fatty acids

Glucose

Glycerol

15. What is the role of the pancreas in digestion?

Absorbs nutrients

Stores bile

Mixes food mechanically

Produces digestive enzymes

16. What is the main role of the gallbladder?

Produce insulin

Digest carbohydrates

Store and concentrate bile

Absorb nutrients

17. Which part of the digestive system absorbs most of the water?

Stomach

Liver

Large intestine

Small intestine

18. Which vitamin is absorbed in the large intestine?

Vitamin B12

Vitamin C

Vitamin D

Vitamin K

19. Which structure absorbs water and forms feces?

Large intestine

Stomach

Small intestine

Pancreas

20. Which part of the small intestine receives bile and pancreatic juice?

Duodenum

Jejunum

Cecum

Ileum

21. Which of the following is the main site for digestion and absorption of nutrients?

Esophagus

Large intestine

Small intestine

Stomach

22. Which hormone stimulates the release of gastric juice?

Insulin

Glucagon

Secretin

Gastrin

23. What is the function of the rectum?

Produce bile

Store feces before elimination

Absorb nutrients

Mix food with enzymes

24. What is the function of the villi in the small intestine?

Move food forward

Protect the walls

Produce enzymes

Absorb nutrients

25. Which enzyme begins the digestion of starch in the mouth?

Trypsin

Amylase

Pepsin

Lipase

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26. Which organ produces insulin and digestive enzymes?

Appendix

Gallbladder

Liver

Pancreas

27. Which of the following structures prevents food from entering the windpipe?

Uvula

Larynx

Tonsils

Epiglottis

28. Which enzyme digests proteins in the stomach?

Pepsin

Maltase

Lipase

Amylase

29. What is the function of the enzyme lipase?

Digests protein

Digests starch

Absorbs calcium

Digests fat

30. Which part of the digestive system is responsible for mixing food with gastric juice?

Esophagus

Small intestine

Rectum

Stomach

31. Which of the following is an accessory digestive organ?

Liver

Small intestine

Colon

Esophagus

32. Which part of the digestive tract connects the mouth to the stomach?

Pharynx

Larynx

Esophagus

Trachea

33. What substance in the stomach helps kill bacteria and activate enzymes?

Sodium bicarbonate

Hydrochloric acid

Bile

Insulin

34. Which of these best describes the liver’s function in digestion?

Produces digestive enzymes

Absorbs nutrients

Produces bile

Stores undigested food

35. What is the function of bile in digestion?

Neutralizes stomach acid

Emulsifies fats

Breaks proteins

Absorbs vitamins

36. What is the main function of the stomach in digestion?

Break down food with acid and enzymes

Absorb water

Produce insulin

Store bile

37. Which part of the digestive system produces hydrochloric acid?

Stomach

Small intestine

Pancreas

Liver

38. Which of the following nutrients does NOT begin digestion in the mouth?

None of the above

Carbohydrates

Proteins

All of the above

39. What is the role of sodium bicarbonate in digestion?

Breaks down protein

Produces bile

Neutralizes stomach acid in the small intestine

Activates enzymes

40. What is the term for the rhythmic contractions that move food through the digestive tract?

Digestion

Absorption

Diffusion

Peristalsis

41. Which nutrient begins its digestion in the mouth?

Carbohydrates

Fats

Vitamins

Proteins

42. Where is bile stored before being released into the small intestine?

Stomach

Pancreas

Liver

Gallbladder

43. Which structure connects the mouth to the esophagus?

Pharynx

Uvula

Trachea

Larynx

44. Where does most protein digestion take place?

Mouth

Stomach

Large intestine

Small intestine

45. What is the function of the appendix in digestion?

Produces enzymes

Stores bile

Absorbs water

No known essential function

46. What type of digestion occurs in the mouth?

Only chemical

Absorptive

Only mechanical

Mechanical and chemical

47. Which part of the large intestine connects to the small intestine?

Sigmoid colon

Anus

Cecum

Rectum

48. What triggers the release of bile from the gallbladder?

Presence of fats in the small intestine

Presence of starch

Acid in the stomach

High blood sugar

49. Where is the enzyme pepsin active?

Small intestine

Stomach

Large intestine

Mouth

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Mustansar KhanLast Updated: October 14, 2025

Important Biology Digestion Question and Answer

Biology Digestion Practice Test Online With Explanation

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