50 Most Important NEET PYQs of Chapter 16: Digestion and Absorption – Part 2 (Q26–50)

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 🔥 50 Most Important NEET PYQs of Chapter 16: Digestion and Absorption – Part 2 (Q26–50)

📚 By neetpyqall | biologyatease1.blogspot.com

Let’s now complete the second half! Here’s Q26–50 of Chapter 16: Digestion and Absorption.

26. Vitamin essential for calcium absorption is:

A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
✅ Answer: D) Vitamin D
🧠 Explanation: Vitamin D promotes absorption of calcium from the intestine.

27. Lacteals are concerned with absorption of:

A) Sugars
B) Amino acids
C) Fats
D) Minerals
✅ Answer: C) Fats
🧠 Explanation: Lacteals (lymphatic vessels in villi) absorb fatty acids and glycerol.

28. Which of the following is NOT digested in the stomach?

A) Proteins
B) Fats
C) Carbohydrates
D) Both B and C
✅ Answer: D) Both B and C
🧠 Explanation: Only proteins are digested in the stomach, not carbohydrates or fats.

29. The semi-liquid mass of partly digested food in the stomach is called:

A) Bolus
B) Chyme
C) Chyle
D) Pulp
✅ Answer: B) Chyme
🧠 Explanation: Chyme is the acidic, partially digested food in the stomach.

30. Which of the following layers forms peristaltic movements?

A) Serosa
B) Submucosa
C) Muscularis
D) Mucosa
✅ Answer: C) Muscularis
🧠 Explanation: Muscularis (smooth muscle layer) is responsible for peristalsis.

31. Chief function of the large intestine is:

A) Digestion
B) Absorption of water
C) Absorption of proteins
D) Absorption of carbohydrates
✅ Answer: B) Absorption of water
🧠 Explanation: The large intestine mainly absorbs water and electrolytes.

32. Which one is a brush border enzyme?

A) Pepsin
B) Lipase
C) Sucrase
D) Trypsin
✅ Answer: C) Sucrase
🧠 Explanation: Brush border enzymes like sucrase are present in the intestinal mucosa.

33. Which of the following is mismatched?

A) Amylase – Starch digestion
B) Lipase – Fat digestion
C) Pepsin – Lipid digestion
D) Trypsin – Protein digestion
✅ Answer: C) Pepsin – Lipid digestion
🧠 Explanation: Pepsin digests proteins, not lipids.

34. Bile salts activate:

A) Lipase
B) Pepsin
C) Amylase
D) None
✅ Answer: A) Lipase
🧠 Explanation: Bile salts help emulsify fats, aiding lipase activity.

35. Pancreatic juice contains:

A) Only amylase
B) Only lipase
C) Only protease
D) Amylase, lipase, and proteases
✅ Answer: D) Amylase, lipase, and proteases
🧠 Explanation: Pancreatic juice is rich in enzymes for digesting carbohydrates, fats, and proteins.

36. Which structure prevents food from entering the windpipe?

A) Uvula
B) Glottis
C) Epiglottis
D) Pharynx
✅ Answer: C) Epiglottis
🧠 Explanation: Epiglottis covers the glottis to prevent choking during swallowing.

37. Hydrolysis of starch into maltose is catalyzed by:

A) Maltase
B) Amylase
C) Lactase
D) Sucrase
✅ Answer: B) Amylase
🧠 Explanation: Amylase breaks starch into maltose units.

38. Which of the following secretes intrinsic factor?

A) Chief cells
B) Goblet cells
C) Oxyntic (parietal) cells
D) Mucous cells
✅ Answer: C) Oxyntic (parietal) cells
🧠 Explanation: Intrinsic factor is needed for vitamin B12 absorption.

39. Activation of pepsinogen requires:

A) Alkaline pH
B) Acidic pH
C) Neutral pH
D) No pH change
✅ Answer: B) Acidic pH
🧠 Explanation: HCl in the stomach provides acidic conditions for pepsinogen activation.

40. Enzyme that digests milk protein in infants:

A) Pepsin
B) Rennin
C) Trypsin
D) Lipase
✅ Answer: B) Rennin
🧠 Explanation: Rennin (chymosin) curdles milk to digest it effectively in infants.

41. Secretin mainly acts on:

A) Stomach
B) Liver
C) Pancreas
D) Gallbladder
✅ Answer: C) Pancreas
🧠 Explanation: Secretin stimulates the pancreas to secrete bicarbonate-rich juice.

42. Peyer's patches are present in:

A) Duodenum
B) Jejunum
C) Ileum
D) Colon
✅ Answer: C) Ileum
🧠 Explanation: Peyer’s patches are lymphoid tissues found in the ileum.

43. Hormone that slows gastric emptying:

A) Gastrin
B) Secretin
C) CCK
D) Enterogastrone
✅ Answer: D) Enterogastrone
🧠 Explanation: Enterogastrone inhibits gastric motility and slows down stomach emptying.

44. Most water absorption in alimentary canal occurs in:

A) Colon
B) Duodenum
C) Ileum
D) Jejunum
✅ Answer: A) Colon
🧠 Explanation: Although some water absorption occurs earlier, the majority happens in the large intestine (colon).

45. Enzyme not present in pancreatic juice:

A) Amylase
B) Lipase
C) Maltase
D) Trypsinogen
✅ Answer: C) Maltase
🧠 Explanation: Maltase is found in the brush border, not in pancreatic juice.

46. End product of protein digestion is:

A) Peptides
B) Amino acids
C) Nucleotides
D) Glycerol
✅ Answer: B) Amino acids
🧠 Explanation: Proteins are finally broken down into amino acids for absorption.

47. The sphincter between stomach and small intestine:

A) Ileocecal sphincter
B) Pyloric sphincter
C) Cardiac sphincter
D) Anal sphincter
✅ Answer: B) Pyloric sphincter
🧠 Explanation: The pyloric sphincter controls the passage of chyme into the small intestine.

48. Villi increase:

A) Blood supply
B) Surface area
C) Number of digestive glands
D) Muscular movement
✅ Answer: B) Surface area
🧠 Explanation: Villi and microvilli massively increase surface area for absorption.

49. Largest part of the small intestine:

A) Duodenum
B) Jejunum
C) Ileum
D) Cecum
✅ Answer: C) Ileum
🧠 Explanation: The ileum is the longest portion of the small intestine.

50. What triggers the release of secretin?

A) Presence of acidic chyme in duodenum
B) Presence of proteins
C) Presence of lipids
D) Presence of bile salts
✅ Answer: A) Presence of acidic chyme in duodenum
🧠 Explanation: Secretin is released when acidic chyme enters the duodenum to neutralize it.

🎯 Congratulations! You have completed all 50 important PYQs of Chapter 16: Digestion and Absorption!
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