Free Digestion MCQs with Answers
680 Digestion MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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- A. Liver
- B. Kidney
- C. Nephron
- D. Glomerulus
Explanation: Option [a] Liver plays a central role in all metabolic processes in the body.
Correct answer: Liver- A. Amylase
- B. Lipase
- C. Enterokinase
- D. Pepsin
Explanation: [A] Amylase is release in mouth in active form[B] Lipase is released in pancreatic juice to break down fats[C] Enterokinase is a protease…
Correct answer: Pepsin- A. Secretin
- B. Pepsinogen
- C. Gastrin
- D. Both Gastrin and Secretin
Explanation: [A] Secretin is a hormone released by duodenum which stimulates secretion by the liver and pancreas[B] Pepsinogen is released in stomach…
Correct answer: Secretin- A. Hard Palate
- B. Soft Palate
- C. Epiglottis
- D. Larynx
Explanation: Option [A] hard palate plays a significant role as it separates the oral cavity from the nasal cavity and aiding swallowing and…
Correct answer: Soft Palate645. Beri Beri is due to:
- A. Metabolic disorder
- B. Chemical causes
- C. Nutritional deficiency
- D. Mental Illness
Explanation: Option A is incorrect since a metabolic disorder occurs when the metabolism process fails whereas beri beri is caused by deficiency of…
Correct answer: Nutritional deficiency- A. Bolus
- B. Bolus or chyme
- C. Mucus
- D. Chyme
Explanation: After food enters the stomach, the muscular walls of the stomach contract and mix the food with gastric juices, breaking it down into a…
Correct answer: Chyme- A. Goblet cells
- B. Absorptive cells
- C. Enterokinase
- D. Peptidase
Explanation: Enterokinase, also known as enteropeptidase, converts inactive trypsinogen into active trypsin in the duodenum, where it helps in protein…
Correct answer: Enterokinase- A. Pepsinogen, Pepsin
- B. Pepsinogen, Trypsin
- C. Trypsinogen, Trypsin
- D. Chymotrypsinogen, Chymotrypsin
Explanation: The correct answer is Trypsinogen is activated to Trypsin by Enterokinase, which is an enzyme secreted by the lining of the duodenum.
Correct answer: Trypsinogen, Trypsin- A. Pepsin
- B. Pepsinogen
- C. Gastrin
- D. HCl
Explanation: HCL (Hydrochloric acid): This option is the correct answer. Oxyntic cells, also known as parietal cells, in the stomach are responsible…
Correct answer: HCl- A. Parietal Cells
- B. Goblet Cells
- C. Chief Cells
- D. Zymogen Cells
Explanation: Parietal cells (also known as oxyntic cells) are epithelial cells in the stomach that secrete hydrochloric acid (HCl).
Correct answer: Parietal Cells- A. Submucosa
- B. Mucosa
- C. Muscularis
- D. Serosa
Explanation: Mucosa is the innermost layer of the digestive tract and is responsible for secretion and absorption.
Correct answer: Mucosa- A. Glottis
- B. Tongue
- C. Cheeks
- D. Epiglottis
Explanation: The epiglottis is a leaf-shaped flap of cartilage located behind the tongue, at the top of the larynx.
Correct answer: Epiglottis- A. Mucosa
- B. Visceral fat cells
- C. Mucus cells
- D. Oxyntic cells
Explanation: Since the other labeled cells are Zymogen cells (also known as acinar cells, which secrete digestive enzymes), the unlabeled cell type…
Correct answer: Oxyntic cells- A. 4
- B. 3
- C. 6
- D. 2
Explanation: Human salivary glands are divided into two main types: major salivary glands (parotid, submandibular, and sublingual) and numerous minor…
Correct answer: 6- A. Hepatic artery
- B. Hepatic vein
- C. Hepatic portal vein
- D. Hepatic portal artery
Explanation: The hepatic portal vein is the vessel that carries nutrient-rich blood containing digested food from the small intestine to the liver.
Correct answer: Hepatic portal vein- A. Amlyase
- B. Lipase
- C. Hydrochloric Acid
- D. Trypsin
Explanation: Pancreatic juice composition. Pancreatic juice is composed of water, mineral salts, enzymes, amylase, lipase, inactive enzyme precursors…
Correct answer: Hydrochloric Acid- A. Grasshoper and protozoa
- B. Grasshopper and frog
- C. Earthworm and protozoa
- D. Frog and protozoa
Explanation: Do you know what protozoans are? Yes, you do! They are single-cell organisms, just think if they are single-celled, why will they do…
Correct answer: Grasshopper and frog- A. Buccal chamber
- B. Intestine
- C. Rectum
- D. Intestinal caecum
Explanation: This needs a detailed analysis of the digestive system of earthworms.As this diagram shows esophagus opens into the intestine.
Correct answer: Intestine- A. Salivary gland
- B. Stomach
- C. Intestine
- D. Liver
Explanation: While bacteria are found in the mouth, they are not found within glands like the salivary gland. Therefore, A is incorrect.
Correct answer: Intestine- A. break down of cellulose
- B. synthesize some vitamins
- C. produce intestinal juice
- D. absorb water and mineral salts
Explanation: The large intestine is home to trillions of bacteria which are majorly involved in the production of vitamins (vit B1, B9, B7, B2, b5…
Correct answer: synthesize some vitamins