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

Here below some basic MCQ’s of “Digestion and Absorption” with answer which is explained in details. Let’s check one by one which is given below.

MCQ 1:
Which enzyme is responsible for the breakdown of carbohydrates in the mouth?

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

Answer: A) Amylase

Explanation: Salivary amylase, also known as ptyalin, is an enzyme secreted by the salivary glands that begins the digestion of carbohydrates into simpler sugars.

MCQ 2:
Where does the majority of nutrient absorption occur in the human digestive system?

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

Answer: B) Small intestine

Explanation: The small intestine, specifically the jejunum and ileum, is the primary site for nutrient absorption, including carbohydrates, proteins, and fats.

MCQ 3:
What is the role of bile in digestion?

A) To digest proteins
B) To emulsify fats
C) To absorb carbohydrates
D) To neutralize stomach acid

Answer: B) To emulsify fats

Explanation: Bile, produced by the liver and stored in the gallbladder, contains bile salts that emulsify fats, increasing their surface area for more effective digestion by lipases.

MCQ 4:
Which of the following nutrients is absorbed primarily in the large intestine?

A) Amino acids
B) Fatty acids
C) Water
D) Monosaccharides

Answer: C) Water

Explanation: The large intestine mainly absorbs water and electrolytes, helping to concentrate waste and maintain fluid balance in the body.

MCQ 5:
What is the main function of villi in the small intestine?

A) To secrete digestive enzymes
B) To increase surface area for absorption
C) To transport bile
D) To produce mucus

Answer: B) To increase surface area for absorption

Explanation: Villi are small, finger-like projections lining the small intestine that significantly increase the surface area, enhancing the absorption of nutrients.

MCQ 6:
Which part of the digestive system is primarily responsible for protein digestion?

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

Answer: B) Stomach

Explanation: The stomach contains pepsin, an enzyme that begins the digestion of proteins into peptides.

MCQ 7:
Which of the following substances is absorbed directly into the bloodstream from the digestive tract?

A) Triglycerides
B) Amino acids
C) Fatty acids
D) Monosaccharides

Answer: B) Amino acids

Explanation: Amino acids are absorbed directly into the bloodstream through the walls of the small intestine.

MCQ 8:
What role does hydrochloric acid play in the stomach?

A) Neutralizes enzymes
B) Activates digestive enzymes
C) Absorbs nutrients
D) Emulsifies fats

Answer: B) Activates digestive enzymes

Explanation: Hydrochloric acid creates an acidic environment that activates pepsinogen to pepsin, enabling protein digestion.

MCQ 9:
Which of the following structures increases the surface area of the small intestine?

A) Microvilli
B) Goblet cells
C) Plicae circulares
D) Both A and C

Answer: D) Both A and C

Explanation: Microvilli and plicae circulares increase the surface area for absorption in the small intestine.

MCQ 10:
Which enzyme breaks down lipids in the small intestine?

A) Amylase
B) Lipase
C) Protease
D) Lactase

Answer: B) Lipase

Explanation: Lipase is the enzyme responsible for breaking down fats into fatty acids and glycerol.