Digestion and Absorption

Class 11th Biology – 16 Digestion and Absorption MCQs

Digestion process in human is

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In human beings, digestion occurs in the lumen of the alimentary canal.

____ part of the tongue contains the taste buds.

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The upper surface of the tongue has small projections called papillae and some of the papillae contain taste buds.

Angiotensinogen is a protein produced and secreted by

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Angiotensinogen is a protein secreted by liver cells.

Normal bacterial flora is present in ____, a small blind sac in the large intestine.

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The large intestine consists of caecum, colon and rectum. Caecum is a small blind sac which hosts some symbiotic micro-organisms.

Digestion is

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Hydrolysis of food subtance is called Digestion. Digestion is the process of matabolism whereby a biological entity processes a substance, in order to chemically and mechanically convert the subtance into nutrients.

Major function of HCI of gastric juice is

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Oxyntic cells of stomach secrete HCI, which provide acidic medium and kill micro-organisms.

Most of the water reabsorption takes place in the ____.

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Most of the water reabsorption takes place in the large intestine.

____ cells of gastric glands secrete enzymes that digest protein.

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Chief cells or peptic cells secrete the proenzyme pepsinogen. Hydrochloric acid activates the proenzyme pepsinogen to active enzyme pepsin, which converts proteins into proteoses and peptones.

Emulsification of fat is carried out by

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Bile salts viz sodium glycolate & sodium taurocholate (both are organic salts present in bile) reduce the surface tension of lare fat globules and break them to fine minute fat droplets. This process is know as emulsification of fat.

Digestion of proteins, fats and carbohaydrate is completed in

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Digestion of proteins, fats and carbohaydrate is completed in Ilieum,last part of small intestine.

____ has no significant activity during the digestive activity.

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Large intestine has no significant activity during the digestive activity. Instead, they are involved in the absorption of water,minerals, and secretion of mucus which helps in an easy passage of the waste.

Secretin stimulates production of

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Pancreatic juice secretion is regulated by the hormone secretin, which is produced by the walls of the duodenum upon detection of acid food, proteins, and fats.

Mark the matching pair

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Invertase is the enzyme that catalyses the hydrolysis of sucrose into glucose and fructose.

The chemical digestion process is initiated in the ____.

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The chemical process of digestion is initiated in the oral cavity. The salivary amylase acts on carbohydrate and initiates the chemical digestion.

In man the zymogen or chief cells are mainly found in

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Zymogen or chief cells are mainly found in the fundic part of the stomach. They are the most abundant among the gastric glands and secrete proenzymes, propepsin and prorenin. (They are also present in intestine but their main site is stomach).

Insulin deficiency causes

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Insulin deficiency causes diabetes mellitus. It results from hypo-secretion of insulin. The symptoms are excessive urine production, excessive thirst excessive eating.

____ is not the function of liver.

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Insulin is not synthesised in liver. It is synthesized in the pancreas.

Bilirubin and biliverdin are

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Bile is the secretion of liver consisting of bile pigments- bilirubin and biliverdin, bile salts as sodium glycolate and sodium taurocholate. Bile is without any enzyme.

Stool of a person is whitish grey coloured due to malfunction of which of the following organ?

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stool colour is due to the bile pigments biliverdine and bilirubin sereted by liver. If stool colour is whitish grey that means secretion of biliveridin and bilirubin is not proper from the liver.

Drugs are absorbed in ____.

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Drugs are absorbed in mouth and small intestine.

Most of the digested food is absorbed in ____.

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Most of the digested food such as glucose, fructose, and amino acids are absorbed in the small intestine.

In human beings, carbohydrate is stored as glycogen in

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Glycogen is stored in liver & muscles in human beings. Carbohydrates are used primarily as source of chemical energy to be metabolized immediately into glucose or stored as glycogen. synthesis of glycogen is called glycogenesis.

Amino groups of surplus amino acids are turned into urea in

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surplus amino acids undergo deamination producing ammonia, which is later turned into urea through a series of cyclic reactions called ornithine cycle in liver.

____ affects liver due to the deposition of bile pigments.

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Jaundice affects liver due to the deposition of bile pigments.

____ help in lubrication in the small intestine.

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In the small intestine, the mucosal epithelium has goblet cells which secrete mucus that help in lubrication.

____ is controlled by the medulla.

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Vomiting is controlled by the vomit centre in the medulla.

____ activates the enzymes in the pancreatic juice.

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Enterokinase activates trypsinogen to trypsin, which in turn activates the other enzymes in the pancreatic juice.

The contraction of gall bladder is due to

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Secretin released by duodenum inhibits movements in gastric intestinal tract. Enterogasterone inhibits digestive activity of stomach. Gastrin stimulates secretion of HCI.cholecystokinin secreted by duodenum stimulates the sysnthesis of bile into the intestine.

____ is replaced by a set of permanent teeth.

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The temporary milk teeth or deciduous teeth is replaced by a set of permanent or adult teeth in human beings.

Bile secreted by liver passes into gall bladder through

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Bile secreted by liver passes into gall bladder through cysict duct.

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