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. lipase
- B. trypsin
- C. ptyalin
- D. invertase
Explanation: Ptyalin is the salivary enzyme, also called salivary amylase, and it begins the digestion of starch into smaller carbohydrates in the…
Correct answer: ptyalin- A. Gastrin
- B. Enterokinase
- C. Rennin
- D. None of these
Explanation: Gastrin is a hormone released mainly by the stomach lining that stimulates secretion of gastric juice, including hydrochloric acid and…
Correct answer: Gastrin- A. Larynx
- B. Diaphram
- C. Epiglottis
- D. None of these
Explanation: The epiglottis is a flap that covers the opening of the larynx during swallowing and directs food into the oesophagus.
Correct answer: Epiglottis- A. Duodenum
- B. Oesophagus
- C. Larynx
- D. None of these
Explanation: The duodenum is the first part of the small intestine and receives bile and pancreatic juice for digestion.
Correct answer: Duodenum- A. mesentron
- B. crop
- C. gizzard
- D. intestine
Explanation: In a cockroach, the gizzard or proventriculus has a muscular wall and chitinous teeth that grind food mechanically.
Correct answer: gizzard- A. Salmonella typhi
- B. Hepatatis
- C. Bacillus
- D. None of the above
Explanation: Typhoid is caused by Salmonella typhi, a bacterium that commonly spreads through food or water contaminated with human waste.
Correct answer: Salmonella typhi- A. Stomach
- B. Small intestine
- C. Colon
- D. Liver
Explanation: Dysentery commonly involves inflammation of the colon, producing frequent stools that may contain mucus and blood.
Correct answer: Colon- A. Endocrine Gland
- B. Exocrine Gland
- C. Digestive Gland
- D. All of the above
Explanation: The pancreas has both exocrine and endocrine functions, and its exocrine secretions include digestive enzymes released into the small…
Correct answer: All of the above- A. Pepsin
- B. Ptyalin
- C. Lactalase
- D. Bile
Explanation: Salivary glands secrete ptyalin, also called salivary amylase, which begins the digestion of starch in the mouth.
Correct answer: Ptyalin- A. Hydrochloric Acid
- B. Citric Acid
- C. Sulphuric Acid
- D. Acetic Acid
Explanation: The stomach lining secretes hydrochloric acid, which creates a strongly acidic medium for pepsin activity and helps kill many swallowed…
Correct answer: Hydrochloric Acid- A. 6 molar teeth
- B. 8 molar teeth
- C. 10 molar teeth
- D. 12 molar teeth
Explanation: An adult normally has 12 molars: 3 on each side of the upper jaw and 3 on each side of the lower jaw, including the wisdom teeth.
Correct answer: 12 molar teeth- A. Liver
- B. Intestines
- C. Lungs
- D. Kidneys
Explanation: Entamoeba histolytica usually inhabits the large intestine, where it can cause amoebic dysentery, although it may sometimes spread to the…
Correct answer: Intestines- A. Intestine
- B. Stomach
- C. Kidney
- D. Heart
Explanation: The hepatic portal vein carries nutrient-rich blood from the digestive tract to the liver for processing and detoxification, so the…
Correct answer: Intestine- A. Nervous
- B. Reproductive
- C. Digestive
- D. Respiratory
Explanation: The gallbladder belongs to the digestive system because it stores and concentrates bile made by the liver, releasing it into the small…
Correct answer: Digestive- A. Fat, Protein
- B. Acid
- C. Base
- D. Both A & B
Explanation: Cholecystokinin, or CCK, is released mainly when fats and partially digested proteins enter the small intestine, and it stimulates…
Correct answer: Fat, Protein- A. Mucosa
- B. Goblet
- C. Epithelial
- D. Oxyntic
Explanation: Oxyntic cells, also called parietal cells, secrete hydrochloric acid in the gastric glands and help create the acidic stomach environment.
Correct answer: Oxyntic- A. Hepar
- B. Hepta
- C. Heptum
- D. Hilum
Explanation: Hepar is the anatomical and Latin name for the liver, which performs functions such as bile production, detoxification and nutrient…
Correct answer: Hepar- A. cattle
- B. sheep
- C. goat
- D. all of these
Explanation: Liver flukes such as Fasciola hepatica live in the bile ducts and liver of grazing mammals, commonly sheep, cattle, and goats, so all…
Correct answer: all of these- A. nervous system
- B. digestive system
- C. reproductive system
- D. circulatory system
Explanation: In coelenterates, the endoderm forms the gastrodermis, which lines the gastrovascular cavity and carries out digestion.
Correct answer: digestive system- A. ingestion
- B. absorption
- C. assimilation
- D. both a and b
Explanation: Assimilation is the use and incorporation of absorbed nutrients into the body's cells for energy, growth, and repair.
Correct answer: assimilation