Biology · Science General
Human Digestive System
2,002 Questions
The human digestive system explores the breakdown of biomacromolecules, covering organs from the stomach to the small intestine. It involves physiological processes like chyme movement, pH levels, and nutrient absorption in the gut. These fundamental biology concepts are regularly featured in medical and general science competitive exams.
Small intestine functionsBiomacromolecule breakdownStomach and digestionIntestinal bacteria
Human Digestive System Questions
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lactase
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β-galactosidase
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chitinase
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sucrase
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amylases
D
Correct answer
Explanation
The levels increase in pregnancy/lactation and diabetes.
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Phellem
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Phellogen
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Durman
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Tylosids
B
Correct answer
Explanation
Phelloderm takes part in the storage of food.
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Acidity
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Allergy
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Constipation
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Abscess
A
Correct answer
Explanation
Acidity occurs when the stomach produces more acid than is needed for digestion. This often leads to discomfort or heartburn.
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Acid secreted by stomach reaching the heart
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Acid contents going back up into the esophagus
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pH of digestive juices getting further lowered due to intake of acidic foods
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Overproduction of acids in the stomach
B
Correct answer
Explanation
Correct Answer: Acid contents going back up into the esophagus
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Process of digestion in herbivores is slower than in carnivores.
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Herbivores do curdling of food.
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Cellulose takes longer time than meat to get digested.
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Herbivores secrete less efficient enzymes.
C
Correct answer
Explanation
Herbivores mainly consume cellulose which is a complex saccharide. It takes longer time to get digested. Meat is comparatively easily digested. Thus, carnivores have smaller intestine.
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digestion of food
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absorption of food
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assimilation of food
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propulsion of food
B
Correct answer
Explanation
Small intestine is specially designed with finger-like projections called villi for absorption of food. Villi increase the surface area and thus, increase the efficiency of absorption.
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gall bladder
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liver
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pancreas
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intestine
A
Correct answer
Explanation
Bile required for the digestion of fats is stored in the gall bladder.
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gullet
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cilia
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food vacuole
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cytoplasm
D
Correct answer
Explanation
Digestive enzymes in paramecium are produced in the cytoplasm. They move inside the food vacuole and digest the food contents.
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Amylase
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Pepsin
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Trypsin
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Bile
D
Correct answer
Explanation
Bile is probably absent in his digestive tract. Fats are passing out undigested as is evident from the greasy stool. Bilirubin is not getting excreted. Thus, the stool is white.
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It is liquid in nature.
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It consists of partly digested food.
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It is expelled to the stomach.
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It is acidic in nature.
C
Correct answer
Explanation
It is untrue. Chyme is expelled to the duodenum from the stomach.
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Amylase
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Lactase
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Lipase
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Protease
B
Correct answer
Explanation
Inability to digest milk sugar is known as lactose intolerance, which is caused by lactase deficiency. This enzyme helps in the digestion of lactose.
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Liver
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Stomach
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Pancreas
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Large Intestine
C
Correct answer
Explanation
Pancreas synthesises enzymes for digestion of proteins, carbohydrates and fats. It produces pancreatic amylase for carbohydrate digestion, pancreatic lipase for fat digestion and trypsin for protein digestion.
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Erepsin
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Sucrase
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Trypsin
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Maltase
C
Correct answer
Explanation
Intestines do not secrete trypsin. It is produced and secreted by pancreas.
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alkaline conditions
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acidic conditions
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the presence of mucus
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the presence of a cofactor
B
Correct answer
Explanation
Enzyme pepsin digests proteins. Pepsin is secreted by the stomach and requires acidic conditions to manifest its action.
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It prevents the entry of food back up the esophagus.
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It mediates movement of small intestine contents into the large intestine.
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It allows the content of stomach into duodenum.
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It controls the flow of digestive juices from ampulla of vater to the second part of duodenum.
D
Correct answer
Explanation
Correct Answer: It controls the flow of digestive juices from ampulla of vater to the second part of duodenum.