NEET 2025 MCQ with Answer Explanation : “Digestion and Absorption”.

MCQ 21:
Which of the following is a function of the large intestine?

A) Digestion of carbohydrates
B) Production of bile
C) Absorption of vitamins and minerals
D) Secretion of enzymes

Answer: C) Absorption of vitamins and minerals

Explanation: The large intestine absorbs water, electrolytes, and certain vitamins, including those produced by gut bacteria.

MCQ 22:
What component of bile aids in the digestion of fats?

A) Cholesterol
B) Bile salts
C) Bilirubin
D) Phospholipids

Answer: B) Bile salts

Explanation: Bile salts emulsify fats, making them easier for lipase to digest.

MCQ 23:
Which organ is responsible for the majority of nutrient absorption?

A) Stomach
B) Pancreas
C) Small intestine
D) Large intestine

Answer: C) Small intestine

Explanation: The small intestine is the primary site for nutrient absorption due to its extensive surface area.

MCQ 24:
What is the primary carbohydrate that the body uses for energy?

A) Sucrose
B) Lactose
C) Glucose
D) Fructose

Answer: C) Glucose

Explanation: Glucose is the primary energy source for cells and is absorbed directly into the bloodstream from the intestine.

MCQ 25:
What is the function of the ileocecal valve?

A) Prevents backflow from the stomach
B) Regulates the passage from the small intestine to the large intestine
C) Releases bile into the small intestine
D) Secretes digestive enzymes

Answer: B) Regulates the passage from the small intestine to the large intestine

Explanation: The ileocecal valve controls the flow of material from the ileum (small intestine) into the cecum (large intestine) and prevents backflow.

MCQ 26:
Which of the following enzymes is produced by the salivary glands?

A) Pepsin
B) Amylase
C) Lipase
D) Trypsin

Answer: B) Amylase

Explanation: Salivary amylase begins the process of carbohydrate digestion in the mouth.

MCQ 27:
Which type of cell in the stomach secretes hydrochloric acid?

A) Parietal cells
B) Chief cells
C) Goblet cells
D) Mucous cells

Answer: A) Parietal cells

Explanation: Parietal cells in the gastric glands of the stomach secrete hydrochloric acid, which aids in digestion and maintains an acidic environment.

MCQ 28:
Which part of the small intestine is primarily involved in the absorption of nutrients?

A) Duodenum
B) Jejunum
C) Ileum
D) All of the above

Answer: D) All of the above

Explanation: While all parts of the small intestine play a role, the jejunum and ileum are primarily responsible for nutrient absorption.

MCQ 29:
What is the primary form of lipid absorbed by intestinal cells?

A) Triglycerides
B) Fatty acids
C) Glycerol
D) Cholesterol

Answer: B) Fatty acids

Explanation: Fatty acids, along with monoglycerides, are absorbed by intestinal cells after lipid digestion.

MCQ 30:
Which vitamin is absorbed in the presence of intrinsic factor?

A) Vitamin A
B) Vitamin C
C) Vitamin D
D) Vitamin B12

Answer: D) Vitamin B12

Explanation: Intrinsic factor, produced by the stomach, is necessary for the absorption of vitamin B12 in the small intestine.