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

MCQ 71:
Where does the digestion of carbohydrates begin?

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

Answer: B) Mouth

Explanation: Carbohydrate digestion begins in the mouth with the action of salivary amylase.

MCQ 72:
What is the role of gastric juice in digestion?

A) To absorb nutrients
B) To emulsify fats
C) To aid in protein digestion
D) To secrete bile

Answer: C) To aid in protein digestion

Explanation: Gastric juice contains hydrochloric acid and pepsin, which aid in the digestion of proteins.

MCQ 73:
Which of the following statements about the large intestine is true?

A) It absorbs the majority of nutrients.
B) It is responsible for protein digestion.
C) It absorbs water and electrolytes.
D) It secretes digestive enzymes.

Answer: C) It absorbs water and electrolytes.

Explanation: The large intestine primarily absorbs water and electrolytes, concentrating waste for excretion.

MCQ 74:
Which component of the digestive system is responsible for the final absorption of nutrients?

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

Answer: C) Small intestine

Explanation: The small intestine is the main site for the final absorption of nutrients into the bloodstream.

MCQ 75:
What is the function of the rectum?

A) Digestion of carbohydrates
B) Storage of bile
C) Storage of feces
D) Absorption of nutrients

Answer: C) Storage of feces

Explanation: The rectum stores feces until they are expelled from the body during defecation.

MCQ 76:
Which of the following structures is involved in nutrient absorption?

A) Esophagus
B) Stomach
C) Villi
D) Gallbladder

Answer: C) Villi

Explanation: Villi are small, finger-like projections in the small intestine that increase surface area for nutrient absorption.

MCQ 77:
What is the primary role of the liver in metabolism?

A) Digestion of proteins
B) Storage of glucose
C) Production of digestive enzymes
D) Absorption of nutrients

Answer: B) Storage of glucose

Explanation: The liver stores glucose in the form of glycogen and regulates blood glucose levels.

MCQ 78:
Which enzyme breaks down sucrose into glucose and fructose?

A) Lactase
B) Amylase
C) Sucrase
D) Maltase

Answer: C) Sucrase

Explanation: Sucrase is the enzyme that breaks down sucrose into glucose and fructose.

MCQ 79:
Which digestive structure is primarily responsible for the absorption of fats?

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

Answer: B) Small intestine

Explanation: The small intestine is the primary site for the absorption of fats, aided by bile and lipase.

MCQ 80:
What substance neutralizes stomach acid in the small intestine?

A) Bile
B) Pepsin
C) Bicarbonate
D) Amylase

Answer: C) Bicarbonate

Explanation: Bicarbonate, secreted by the pancreas, neutralizes stomach acid as chyme enters the small intestine.