50 Most Important NEET PYQs of Chapter 16: Digestion and Absorption – Part 1 (Q1–25)

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 🔥 50 Most Important NEET PYQs of Chapter 16: Digestion and Absorption – Part 1 (Q1–25)

📚 By neetpyqall | biologyatease1.blogspot.com

Let’s dive into the first 25 PYQs of Chapter 16: Digestion and Absorption — super important for NEET!

1. Which enzyme is not present in gastric juice?

A) Pepsin
B) Rennin
C) Lipase
D) Amylase
✅ Answer: D) Amylase
🧠 Explanation: Amylase is found in saliva and pancreatic juice, but not in gastric juice.

2. In adults, Rennin is:

A) Active
B) Inactive
C) Secreted in large amounts
D) Present in bile
✅ Answer: B) Inactive
🧠 Explanation: Rennin (important for milk protein digestion) is active in infants but absent or inactive in adults.

3. Which of the following is absorbed in the stomach?

A) Proteins
B) Alcohol
C) Fats
D) Starch
✅ Answer: B) Alcohol
🧠 Explanation: Some substances like alcohol and certain drugs are absorbed directly from the stomach.

4. Which organ secretes bile?

A) Pancreas
B) Gallbladder
C) Liver
D) Small intestine
✅ Answer: C) Liver
🧠 Explanation: Bile is secreted by the liver and stored in the gallbladder.

5. Trypsinogen is activated by:

A) Enterokinase
B) Pepsin
C) Amylase
D) Rennin
✅ Answer: A) Enterokinase
🧠 Explanation: Enterokinase secreted by intestinal mucosa converts trypsinogen into active trypsin.

6. The major function of bile is:

A) Protein digestion
B) Fat emulsification
C) Carbohydrate digestion
D) Vitamin absorption
✅ Answer: B) Fat emulsification
🧠 Explanation: Bile salts break fats into smaller droplets, aiding digestion.

7. Emulsification of fats is carried out by:

A) Lipase
B) Bile salts
C) Trypsin
D) Amylase
✅ Answer: B) Bile salts
🧠 Explanation: Bile salts lower surface tension and help break down large fat globules.

8. Which part of the alimentary canal receives bile?

A) Duodenum
B) Jejunum
C) Stomach
D) Colon
✅ Answer: A) Duodenum
🧠 Explanation: Bile is released into the duodenum through the bile duct.

9. Which layer forms the villi in the intestine?

A) Mucosa
B) Submucosa
C) Muscularis
D) Serosa
✅ Answer: A) Mucosa
🧠 Explanation: The mucosa layer of the intestine forms villi, which increase surface area for absorption.

10. Which digestive gland is the largest?

A) Salivary gland
B) Liver
C) Pancreas
D) Gastric gland
✅ Answer: B) Liver
🧠 Explanation: The liver is the largest gland in the human body.

11. Crypts of Lieberkühn are found in:

A) Stomach
B) Small intestine
C) Pancreas
D) Esophagus
✅ Answer: B) Small intestine
🧠 Explanation: These are glands located between the villi in the intestinal mucosa.

12. The inactive enzyme pepsinogen is secreted by:

A) Chief cells
B) Goblet cells
C) Oxyntic cells
D) Paneth cells
✅ Answer: A) Chief cells
🧠 Explanation: Chief cells of gastric glands secrete pepsinogen.

13. Chyme is formed in:

A) Esophagus
B) Stomach
C) Duodenum
D) Colon
✅ Answer: B) Stomach
🧠 Explanation: Chyme is the semi-digested food formed after the stomach churns the food.

14. The stomach mainly digests:

A) Fats
B) Carbohydrates
C) Proteins
D) Vitamins
✅ Answer: C) Proteins
🧠 Explanation: Pepsin in gastric juice mainly digests proteins.

15. Which is not a function of HCl in stomach?

A) Activating pepsinogen
B) Killing bacteria
C) Digesting carbohydrates
D) Providing acidic pH
✅ Answer: C) Digesting carbohydrates
🧠 Explanation: HCl provides acidic conditions, activates enzymes, and kills microbes — not carbohydrate digestion.

16. Cholecystokinin (CCK) stimulates:

A) Liver to secrete bile
B) Gallbladder to release bile
C) Pancreas to release insulin
D) Gastric secretion
✅ Answer: B) Gallbladder to release bile
🧠 Explanation: CCK triggers gallbladder contraction and bile release into duodenum.

17. Goblet cells secrete:

A) Enzymes
B) Mucus
C) Hydrochloric acid
D) Bile
✅ Answer: B) Mucus
🧠 Explanation: Goblet cells secrete mucus to protect the intestinal lining.

18. Brunner's glands are found in:

A) Stomach
B) Duodenum
C) Jejunum
D) Colon
✅ Answer: B) Duodenum
🧠 Explanation: Brunner’s glands in the duodenum secrete alkaline mucus to neutralize stomach acid.

19. Which part of the alimentary canal does not secrete digestive enzymes?

A) Mouth
B) Stomach
C) Esophagus
D) Small intestine
✅ Answer: C) Esophagus
🧠 Explanation: Esophagus mainly transports food without enzyme secretion.

20. Enzyme not found in pancreatic juice:

A) Trypsin
B) Amylase
C) Lipase
D) Pepsin
✅ Answer: D) Pepsin
🧠 Explanation: Pepsin is secreted in the stomach, not by pancreas.

21. Bile contains:

A) Enzymes
B) Bile pigments and salts
C) Digestive hormones
D) All of these
✅ Answer: B) Bile pigments and salts
🧠 Explanation: Bile lacks enzymes; it contains bile salts and pigments (bilirubin, biliverdin).

22. Absorption of glucose mainly occurs in:

A) Stomach
B) Large intestine
C) Duodenum and jejunum
D) Rectum
✅ Answer: C) Duodenum and jejunum
🧠 Explanation: Glucose absorption occurs predominantly in the duodenum and jejunum via active transport.

23. Hormone that stimulates gastric secretion:

A) Secretin
B) CCK
C) Gastrin
D) Enterogastrone
✅ Answer: C) Gastrin
🧠 Explanation: Gastrin stimulates secretion of gastric juices, especially HCl.

24. Which food component is digested by lipase?

A) Proteins
B) Carbohydrates
C) Fats
D) Nucleic acids
✅ Answer: C) Fats
🧠 Explanation: Lipase breaks down fats into fatty acids and glycerol.

25. Kupffer cells are:

A) Hepatic cells
B) Phagocytic cells in liver
C) Exocrine cells of pancreas
D) Endocrine cells of stomach
✅ Answer: B) Phagocytic cells in liver
🧠 Explanation: Kupffer cells in the liver are specialized macrophages that engulf pathogens and debris.

🌟 Amazing! You've covered Part 1 (Q1–25) of Chapter 16!
📚 Keep revising to lock these concepts for NEET!

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