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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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Human Digestive System
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680 questions · page 14 of 34

261. Embedded in the tentacles of hydra are numerous stinging cells called _

  • A. Caeca
  • B. Nematocysts
  • C. Mesentron stomach
  • D. None

Explanation: •Branches of the intestine in planaria further give off numerous branches called caeca •In cockroaches, the midgut is a short narrow tube…

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Correct answer: Nematocysts

262. In cockroaches partly digested food is stored in the:

  • A. Crop
  • B. Gizzard
  • C. Rectum
  • D. Hepatic caeca

Explanation: •Food leaves the crop chunk by chunk after being ground in the gizzard•The indigestible food is temporarily stored in the rectum before it…

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Correct answer: Crop

263. Which of the following is not a function of the oral cavity?

  • A. Absorption
  • B. Selecting of food
  • C. Grinding
  • D. Lubrication and digestion

Explanation: When food enters the oral cavity it is tasted, smelled, and felt Food is ground by means of molar teeth These main functions are…

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Correct answer: Absorption

264. As a result of mastication the softened partly digested and slimy food mass is rolled into a small oval lump called:

  • A. Glottis
  • B. Bolus
  • C. Epiglottis
  • D. Ptyalin

Explanation: As a result of mastication, the softened, partly digested and slimy food mass is rolled into a small oval lump called bolus.

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Correct answer: Bolus

265. The characteristic movements of the digestive tract by which food is moved along the cavity of the canal are called:

  • A. Peristalsis
  • B. Antiperistalsis
  • C. Hunger contractions
  • D. Hunger pangs

Explanation: Peristalsis is the involuntary contraction and relaxation of longitudinal and circular muscles throughout the digestive tract, allowing…

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Correct answer: Peristalsis

266. The internal surface of ileum has many folds, which exhibits velvety appearance due to the presence of numerous finger like outgrowths which are called as:

  • A. Microvilli
  • B. Villi
  • C. Ileocolic sphincter
  • D. Cardiac sphincter

Explanation: Intestinal villi are tiny, finger-like projections made up of cells that line the entire length of your small intestine.

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Correct answer: Villi

267. The masses of dilated and tortuous veins in the anorectal mucosa are called:

  • A. Ulcers
  • B. Piles
  • C. Bulimia nervosa
  • D. Obesity

Explanation: Haemorrhoids (piles) are enlarged blood vessels that you can get inside or around your anus (the opening of your bottom).

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Correct answer: Piles

268. The movement of digested products and water across the GI tract epithelium and into the underlying blood and lymphatic vessels is called :

  • A. Ingestion
  • B. Digestion
  • C. Assimilation
  • D. Absorption

Explanation: The simple molecules that result from chemical digestion pass through cell membranes of the lining of the small intestine into the blood…

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Correct answer: Absorption

269. The main function of intestinal villi is to:

  • A. Stimulate peristalsis
  • B. Prevent antiperistalsis
  • C. Provide a large surface area of absorption
  • D. Distribute digestive enzymes uniformly

Explanation: The villi of the small intestine project into the intestinal cavity, greatly increasing the surface area for food absorption and adding…

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Correct answer: Provide a large surface area of absorption

270. Carbohydrate digesting enzyme that converts starch into maltose is :

  • A. Amylopectin
  • B. Amylase
  • C. Trypsin
  • D. Both A and B

Explanation: Amylase (made in the mouth and pancreas; breaks down complex carbohydrates).

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Correct answer: Amylase

271. All the insectovirous plants are:

  • A. Heterotrophic
  • B. Autotrophic
  • C. Decomposers
  • D. Parasites

Explanation: All the insectivorous plants are autotrophs but when they capture prey their growth becomes rapid.Insectivorous plants are not parasites…

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Correct answer: Autotrophic

272. End of the leaf is modified to form a hood in:

  • A. Sarracenia purpurea
  • B. Drosera intermedia
  • C. Venus fly trap

Explanation: The correct option is Sarracenia purpurea

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Correct answer: Sarracenia purpurea

273. Pick out the different:

  • A. Dodder
  • B. Sundew
  • C. Venus fly trap
  • D. Pitcher plant

Explanation: Dodder is an annual seed bearing parastic vine while all others are insectivorous plants.

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Correct answer: Dodder

274. In which of the following types of animals would you except the digestive tract to be more complex:

  • A. Those with single opening
  • B. Those with multiple openings
  • C. Those with two openings
  • D. Those without any opening

Explanation: Those animals which have tubular type digestive system are more complex as compared to sac like digestive system.Tube has two openings.

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Correct answer: Those with two openings

275. Churning of the food in the mouth significantly improves the digestibility of food stuff by the enzymes:

  • A. Mastication
  • B. Peristalsis
  • C. Churning
  • D. Acidity

Explanation: Masticiation increase the surface area of food particles which provide site of action for enzymes and significantly improves the…

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Correct answer: Mastication

276. The digestion of carbohydrates occurs briefly in _ and largely in the _ respectively.

  • A. Mouth, intestine
  • B. Stomach, intestine
  • C. Esophagus, mouth
  • D. Mouth, stomach

Explanation: Oral cavity has amylase enzyme and intestine has amylapsin, lactase and maltase for complete digestion of carbohydrates.

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Correct answer: Mouth, intestine

277. On taking a spoonful of boiled rice and after partial digestion which of the following biomolccule cannot be the part of bolus?

  • A. Protein
  • B. Vitamins
  • C. Amylase
  • D. Disaccharide

Explanation: Since amylase is an enzyme so it is not a physical part of the bolus

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Correct answer: Amylase

278. Align the following events performed by oral cavity: 1) Digestion 2) Mastication 3) Lubrication 4) Selection

  • A. 1,3,4,2
  • B. 4,2,1,3
  • C. 4,3,2,1
  • D. 4,2,3,1

Explanation: 1-Selection of food, 2- Mastication, 3- Lubrication, 4-Enzymitic digestion of food (Starch) will occur in oral cavity.

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Correct answer: 4,2,3,1

279. All of the following are influenced by the movement of tongue except:

  • A. Nasal opening
  • B. Teeth cleansing
  • C. Epigiottis
  • D. Peristalsis

Explanation: Peristalsis is related to circular and longitudnal muscles of alimentary which stand alter pushing of food to esophagus during swallowing…

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Correct answer: Nasal opening

280. Digestion of _ starts in oral cavity due to the action of enzyme present in :

  • A. Starch
  • B. Fatty Acids
  • C. Cellulose
  • D. Polypeptides

Explanation: The slavery glands present in our mouth are responsible for secreting salivary amylase which digests starch present in our food therefore…

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Correct answer: Starch
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