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. What is the main role of the gallbladder?

Produce insulin

Store and concentrate bile

Digest carbohydrates

Absorb nutrients

2. What is the role of the enzyme sucrase?

Breaks down starch

Converts sucrose into glucose and fructose

Emulsifies fat

Breaks down protein

3. What is the function of the rectum?

Store feces before elimination

Mix food with enzymes

Produce bile

Absorb nutrients

4. Which vitamin is absorbed in the large intestine?

Vitamin K

Vitamin D

Vitamin B12

Vitamin C

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

Bile

Insulin

Hydrochloric acid

Sodium bicarbonate

6. Where does most protein digestion take place?

Mouth

Stomach

Large intestine

Small intestine

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

Stores undigested food

Absorbs nutrients

Produces bile

Produces digestive enzymes

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

Small intestine

Esophagus

Colon

Liver

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

Cecum

Sigmoid colon

Rectum

Anus

10. What is the function of the enzyme maltase?

Breaks down lipids

Converts maltose into glucose

Emulsifies fats

Converts proteins into peptides

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

Amylase

Pepsin

Trypsin

Lipase

12. Which structure connects the mouth to the esophagus?

Trachea

Larynx

Pharynx

Uvula

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

Pancreas

Stomach

Liver

Gallbladder

14. Which organ produces insulin and digestive enzymes?

Gallbladder

Appendix

Liver

Pancreas

15. Which hormone stimulates the release of gastric juice?

Gastrin

Insulin

Glucagon

Secretin

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

None of the above

All of the above

Carbohydrates

Proteins

17. Where is the enzyme pepsin active?

Small intestine

Stomach

Large intestine

Mouth

18. What is the function of bile in digestion?

Absorbs vitamins

Breaks proteins

Emulsifies fats

Neutralizes stomach acid

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

Stores bile

Absorbs nutrients

Produces digestive enzymes

Mixes food mechanically

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

Exocrine gland only

Digestive organ only

Both endocrine and exocrine

Endocrine gland only

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

No known essential function

Stores bile

Absorbs water

Produces enzymes

22. What is the function of the enzyme lipase?

Digests fat

Digests protein

Absorbs calcium

Digests starch

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

Pharynx

Trachea

Esophagus

Larynx

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

Duodenum

Jejunum

Cecum

Ileum

25. What type of digestion occurs in the mouth?

Mechanical and chemical

Absorptive

Only chemical

Only mechanical

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26. What is the end product of carbohydrate digestion?

Amino acids

Fatty acids

Glycerol

Glucose

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

Small intestine

Esophagus

Stomach

Large intestine

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

Neutralizes acid

Absorbs nutrients

Lubricates and protects the lining

Breaks down food

29. What causes the acidic pH in the stomach?

Bile

Gastric mucus

Sodium bicarbonate

Hydrochloric acid

30. 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

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

Trypsin

Amylase

Lipase

Pepsin

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

Villi

Rugae

Microvilli

Alveoli

33. Which structure absorbs water and forms feces?

Pancreas

Stomach

Small intestine

Large intestine

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

Maltase

Pepsin

Amylase

Trypsin

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

Store bile

Absorb water

Break down food with acid and enzymes

Produce insulin

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

Protect the walls

Move food forward

Absorb nutrients

Produce enzymes

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

Liver

Pancreas

Kidney

Stomach

38. Which nutrient begins its digestion in the mouth?

Vitamins

Fats

Carbohydrates

Proteins

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

Stomach

Small intestine

Liver

Pancreas

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

Large intestine

Small intestine

Stomach

Liver

41. Which enzyme digests proteins in the stomach?

Pepsin

Amylase

Maltase

Lipase

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

Peristalsis

Digestion

Diffusion

Absorption

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

Larynx

Uvula

Epiglottis

Tonsils

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

Glucose

Amino acids

Fatty acids

Vitamins

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

Esophagus

Stomach

Rectum

Small intestine

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

Activates enzymes

Produces bile

Breaks down protein

Neutralizes stomach acid in the small intestine

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

Vitamins

Water

Fiber

Fats

48. Which gland produces saliva?

Thyroid

Adrenal

Pituitary

Parotid

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

Bile

Chyme

Feces

Mucus

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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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