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

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Ideal function of vermiform appendix in human body is________

  1. Digestion of cellulose

  2. Decrease the digestion

  3. Produce more energy

  4. Increase the weight
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In older days humans used to have raw food. So to digest cellulose, enzyme cellulase was secreted by appendix in the intestine of individual.
So, the correct answer is 'Digestion of cellulose'
Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Which of the following enzymes would be most affected by the overdose of antacid?

  1. Maltase

  2. Lactase

  3. Lipase

  4. Pepsin

  5. Sucrase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the stomach, the enzyme pepsin breaks protein into smaller pieces called polypeptides. For proper functioning of pepsin, acidic pH is necessary; a pH of 2 is optimum for pepsin function. Antacids neutralize the normal stomach acid pH and brings it upto 6 to 7. As pH rises above 4, pepsin activity decreases or stops. That is why when a person takes too much antacid the pH of the stomach may rise upto 11, which affect pepsin production severely. Maltase, Lactase, Lipase and Sucrase are produced in small intestine and they are active in pH range from 2 to 6.

So,option D is the correct answer

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

An enzyme that converts starch to disaccharides is known as

  1. Amylase

  2. Gastrin

  3. Secretin

  4. Pepsin

  5. Maltase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  1. Amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. 
  2. The pancreas and salivary gland make amylase to hydrolyse dietary starch into disaccharides and trisaccharides which are converted by other enzymes to glucose to supply the body with energy. 
  3. Foods that contain large amounts of starch but little sugar, such as rice and potatoes, may acquire a slightly sweet taste as they are chewed because amylase degrades some of their starch into sugar. Hence, the enzyme that converts starch to disaccharide is known as amylase.
So, the correct answer is 'amylase'.

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

All of these secretes digestive enzyme, except

  1. Salivary glands.

  2. Liver.

  3. Pancreas.

  4. Small intestine.

  5. Stomach.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Digestive enzymes are the enzymes that involve in the digestion process which secretes through glands like salivary glands, pancreas, stomach and small intestine but liver does not produce any enzyme. It produces bile juice which provides alkaline condition for enzymatic reaction in small intestine.

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Which of the following organ system takes in food, breaks it down into smaller chemical units, and absorbs the nutrient molecules?

  1. Digestive system

  2. Respiratory system

  3. Circulatory system

  4. Endocrine system

  5. Nervous system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The digestive system includes alimentary canal and associated glands to carry out the digestion of food and release the energy stored in these food substances. The nutrients from digested food are then absorbed in the small intestine of the alimentary canal and carried to different organs via the circulatory system. The primary function of the respiratory system is to allow atmospheric oxygen from the air to enter the blood and carbon dioxide from the blood to exit into the air. The endocrine system includes endocrine glands and maintains the homeostasis of the body through hormonal actions. Nervous system serves in the reception of sensory input followed by their integration in the brain and spinal cord and generation of motor output to produce the response. Thus, the correct answer is A.

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Human organism is an internal combustion machine because of

  1. Assimilation of energy from food
  2. Liberate $C{O} _{2}$ during respiration

  3. Expel waste food at the end state digestion

  4. Secrete powerful digestive juices
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During the process of respiration organisms breakdown (burn) assimilated food to release energy in the form of ATP which is utilized for performing various activities and CO$ _2$ and water vapour are released as byproducts.

So, the correct answer is 'Liberate CO$ _2$ during respiration'

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Which does not occur in glucose

  1. Digestion

  2. Ingestion

  3. Absorption

  4. Assimilation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glucose is a simple sugar that is already in a form ready for absorption. It does not undergo digestion, as it is a monosaccharide and cannot be broken down further into simpler units by digestive enzymes.

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion


Which of the following processes carries food through the digestive tract?

  1. Peristalsis

  2. Resorption

  3. Pinocytosis

  4. Neurotransmitters
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The digestive system plays an important role in the absorption of nutrients into the body. It takes the food we ingest, breaks it down mechanically and chemically in the mouth and stomach. It then absorbs nutrients, fats, proteins, and water in the intestines before eliminating the waste through the rectum. The movement of food in the alimentary canal occurs through peristalsis.

So, the correct answer is 'Peristalsis'

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Select the incorrect option regarding digestion and absorption of substances in different parts of digestive system.

  1. In large intestine, absorption of water, some minerals and drugs take place

  2. Absorption of water, simple sugars and alcohol takes place in stomach

  3. Small intestine is the principal organ for absorption of nutrients

  4. The digestion is completed in large intestine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

No significant digestive activity occurs in the large intestine. The functions of large intestine are :

• absorption of some water, minerals and certain drugs.
• secretion of mucus which helps in adhering the waste(undigested) particles together and lubricating it for an easy passage.
So the correct option is "The digestion is completed in large intestine".

Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

The food we take in our body travels through a long and complex path. Which starts from mouth to anus. Which is the correct sequence of process on food in the digestive system?

  1. Digestion $\rightarrow$ Absorption $\rightarrow$ Egestion $\rightarrow$ Ingestion
  2. Ingestion $\rightarrow$ Egestion $\rightarrow$ Digestion $\rightarrow$ Absorption
  3. Digestion $\rightarrow$ Ingestion $\rightarrow$ Absorption $\rightarrow$ Egestion
  4. Ingestion $\rightarrow$ Digestion $\rightarrow$ Absorption $\rightarrow$ Egestion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Ingestion- Ingestion means intake of food into the mouth and chewing of food.
Digestion- Ingested food enters into the stomach where Digestion of food takes place. Many digestive juices get mixed with food and digestion gets completed.
Absorption- Digested food enters into the intestine. The absorption of food takes place in the intestine. intestines have many finger-like projection which is known as villi. Villi help the absorption of food.
Egestion- Excretion of waste occurs in this stage. Waste throws out through the anus.
So, Option D is correct.
Multiple choice evs more about organ system introduction to excretory system structures and functions related to the excretory system introduction to excretion

Food after degiuttition suffers a number of changes in its texture while passing through the gut. Pick out the wrong statement with respect to above statement.

  1. Food mixed with bile, pancreatic juice and succus entencus is called chyle

  2. Chyle is alkaline in pH

  3. Maximum water absorption occurs in colon

  4. Chyme is acidic in nature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The term chyle specifically refers to the milky fluid consisting of lymph and emulsified fats formed in the small intestine during digestion. The mixture of food with bile, pancreatic juice, and succus entericus is generally referred to as chyme (in the stomach) or the intestinal contents, not chyle.

Multiple choice biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

Which of the following statement is incorrect related to digestion?

  1. Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules.

  2. It is a anabolic process.

  3. Digestion is both voluntary and involuntary process.

  4. None of these.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A) Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules.

B) It is a catabolic process as it breaks down the molecule into a simple form.
C) It is voluntary until swallowing as food is swallowed the whole process becomes involuntary.

So the correct option is '(B) It is an anabolic process.
                                         

Multiple choice biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

The final products of digestion should be

  1. Fat soluble and should be able to pass through cell walls.

  2. Water soluble and should be able to pass through cell walls.

  3. Fat soluble and should be able to pass through cell membranes.

  4. Water soluble and should be able to pass through cell membranes.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  •  Digestion is catabolic process in the digestive tract where ingested food is converted into simpler, soluble and diffusible substances that can be assimilated by the body and absorbed into the blood from the intestinal walls.
  • The end product should be water soluble as it has to combine with the plasma of blood.
  • Absorption at intestinal walls is through cell membranes of intestinal cells and walls of blood capillaries.
  • So, the correct answer is 'Water soluble and should be able to pass through cell membranes'.
Multiple choice bio-chemistry minerals minerals and vitamins nutrition and diet role of various nutrients

Engulfing of food in solid or fluid state is

  1. Saprozoic nutrition

  2. Parasitic nutrition

  3. Saprophytic nutrition

  4. Holozoic nutrition
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Holozoic nutrition is a type of heterotrophic nutrition that is characterized by the ingestion and internal processing of gaseous, liquid or solid food particles Protozoa, such as amoebas, and most of the animals, exhibit this type of nutrition. There are several stages of holozoic nutrition, which often occur in separate compartments within an organism :
  • Ingestion 
  • Digestion
  • Absorption
  • Assimilation and
  • Egestion.
Hence, the engulfing of food in a solid or liquid state is holozoic nutrition.
So, the correct answer is 'holozoic nutrition'.
Multiple choice biology digestion and absorption minerals and vitamins nutrition and diet role of various nutrients

Digestion is a .......... process

  1. Mechanical

  2. Chemical

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Digestion is the combination of mechanical as it food convert into a paste by teeth through a process called as mastication and chemical process as it requires various enzymes that break down the complex food material into simpler absorbable form.

So, the correct option is 'Both A and B'