Free Digestion MCQs with Answers

• A. digestion
• B. assimilation
• C. absorption
• D. ingestion

Explanation: Villi and microvilli greatly increase the surface area of the small intestine, allowing digested nutrients to pass more efficiently into…

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

Explanation: The cockroach crop is a storage chamber where ingested food, including partly digested food, is held temporarily before passing onward.

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

Explanation: In the cockroach, the midgut is the stomach, a relatively short, narrow region where digestion and absorption occur; hepatic caeca open…

• A. Antiperistalsis
• B. Peristalsis
• C. Voluntary
• D. None of these

Explanation: Hunger contractions are rhythmic peristaltic contractions of the empty stomach and intestine that help produce the sensation of hunger.

• A. Pyrolysis
• B. Pyrosis
• C. Peristalsis
• D. Dyspepsia

Explanation: Pyrosis is the medical term for heartburn, caused when acidic stomach contents reflux into and irritate the oesophagus.

• A. Digestive tract
• B. Intestinal caeca
• C. Hepatic caeca
• D. Both B & C

Explanation: Planaria have a branched gastrovascular cavity, and its many blind-ending branches are called intestinal caeca.

• A. Obligate
• B. Strict
• C. Facultative
• D. Endoparasite

Explanation: A facultative parasite can live independently when conditions permit but may also obtain nutrients from a host.

• A. Creatin
• B. Gastrin
• C. Secretin
• D. Pepsin

Explanation: Secretin is released by the intestinal mucosa when acidic chyme enters the duodenum, and it stimulates pancreatic bicarbonate secretion…

• A. Fluid
• B. Macrophagous
• C. Fluid
• D. All of these

Explanation: Hydra captures relatively large solid prey with its tentacles and digests it in the gastrovascular cavity, so it is a macrophagous feeder.

• A. Duodenum
• B. Jejunum
• C. Ileum
• D. Caecum

Explanation: The jejunum is approximately 2.4 metres long and forms about two-fifths of the small intestine in the description used here.

• A. Fluid
• B. Macrophagous
• C. Filter
• D. None of these

Explanation: Many whales use baleen to strain plankton and small organisms from large volumes of water, making them filter feeders.

• A. Premolars
• B. Canines
• C. Incisors
• D. Molars.

Explanation: Typical herbivores lack prominent canines because their teeth are adapted mainly for cutting and grinding plant material, with incisors…

• A. 2
• B. 3
• C. 1
• D. 4

Explanation: The anus is controlled by two sphincters: an internal sphincter made of involuntary smooth muscle and an external sphincter made of…

• A. Saraccnia
• B. Dionaea
• C. Pitcher plant
• D. None of these

Explanation: Dionaea, the Venus flytrap, has a bilobed leaf with a midrib and trigger hairs; the two lobes close rapidly around an insect.

• A. Obesity
• B. Dyspepsia
• C. Anorexia nervous
• D. Bulimia nervosa

Explanation: Dyspepsia means indigestion and includes discomfort caused by incomplete or disturbed digestion.

• A. Detritus
• B. Fluid
• C. Macrophageus
• D. Filter

Explanation: Earthworms ingest soil and feed on decaying organic matter, called detritus, so they are detritus feeders.

• A. Anorexia nervosa
• B. Bulimia nervosa
• C. Piles
• D. Dyspepsia

Explanation: Anorexia nervosa is an eating disorder involving severe restriction of food intake and an intense fear of gaining weight or becoming…

• A. Bulimia nervosa
• B. Obesity
• C. Anorexia nervosa
• D. None of these

Explanation: Anorexia nervosa commonly begins around adolescence and is particularly frequent among girls, with restricted eating driven by fear of…

• A. Bulimia
• B. Ulcer
• C. Adipose tissue
• D. Hemorrhoids

Explanation: Hemorrhoids are swollen or dilated tortuous veins in the anorectal region, often causing discomfort or bleeding.

• A. Teeth
• B. Tongue
• C. Smooth muscles
• D. All of these

Explanation: Mastication means mechanical chewing, in which the teeth cut, tear and grind food.