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 zoology animal diversity - ii (phylum: chordata) circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system frog

Stomach of frog does not have

  1. Fundic part

  2. Cardiac part

  3. Pyloric part

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stomach of frog comprises a large broader anterior part called cardiac stomach and a short narrower posterior part called pyloric stomach. Fundic stomach is absent.

Multiple choice zoology animal diversity - ii (phylum: chordata) circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system frog

Which of the following part is not a part of the small
intestine of frog


  1. Ileum

  2. Jejunum

  3. Duodenum

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

Stomach is followed by a coiled small intestine made of a small anterior duodenum and much longer posterior ileum. Jejunum is absent in frog.

Multiple choice botany biotechnology: general introduction microbiology: organisms in industry biotechnology commercial applications of biotechnology

The enzyme TPA or tissue plasminogen activator is used for

  1. Dissolving blood clots

  2. Maintaining plasma content

  3. Clearing turbidity of juices

  4. Stimulating thromboplastin production
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tissue plasminogen activator is a clot-dissolving enzyme that is produced naturally by cells in the walls of blood vessels and catalyzes the conversion of plasminogen to plasmin. A preparation of this enzyme is produced by genetic engineering and used to dissolve clots blocking coronary arteries in heart attack and cranial arteries in certain cases of stroke.

Multiple choice biology what do animals eat? digestion in ruminants nutrition in other organisms busy at work - our internal organs

The digestive tracts of ruminants contain

  1. Halophilic bacteria

  2. Thermoacidophilic bacteria

  3. Methanobacteria

  4. Mycoplasma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methanogens are a group of archaebacteria that occur in marshy areas where they convert formic acid and carbon dioxide into methane. Some of the methanogen archaebacteria live as symbionts (Eg. Methanobacterium) inside the rumen or first chamber in the stomach of herbivorous animals that chew their cud (ruminants). These archaebacteria are helpful to the ruminants in the fermentation of cellulose. 

Halophiles are also archaebacteria which usually occur in the salt-rich substrate like salt marshes e.g. Halobacterium.. Thermoacidophiles have dual ability to tolerate high temperature as well as high acidity. They often live in hot sulphur springs where the temperature may be as high as 80 degrees and pH as low as 2 e.g. Thermoproteus. 
Mycoplasma is the simplest and smallest of free-living prokaryotes. They were discovered in the pleural fluid of cattle suffering from pleuropneumonia and called as Pleuropneumonia-like organisms (PPLOs). 
Thus, the correct answer is option C.

Multiple choice evs - i busy at work - our internal organs digestion in ruminants nutrition in other organisms what do animals eat?

The ruminant stomach has four parts ; but camel lacks one part i.e., .............

  1. Abomasum

  2. Omasum

  3. Rumen

  4. Reticulum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In ruminants, the stomach is differentiated into separate chambers - rumen (for churning, digestion of cellulose and hemicellulose and bacterial fermentation), reticulum (traps and stores temporarily large feed particles), omasum (absorbs water) and abomasum (similar to human stomach, digests proteins). Abomasum is the true stomach. Omasum is absent in camels. In camels rumen and reticulum have diverticula or water pockets for temporary storage of food.

Multiple choice evs - i busy at work - our internal organs digestion in ruminants nutrition in other organisms what do animals eat?

Rumen of a cow is a part of its

  1. Intestine

  2. Stomach

  3. Caecum

  4. Rectum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ruminants (cattle, sheep, deer, giraffes) are hooved animals with a stomach divided into four chambers- rumen, reticulum, omasum, and abomasum. Symbiotic bacteria and protists living in the first two chambers digest cellulose, splitting some of it into sugars, which are then used by the host and the bacteria themselves. The bacteria produce fatty acids during their metabolism, some of which are absorbed by the animal and serve as an important energy source. Food that is not sufficiently chewed clumps together, forming a cud. The cud is regurgitated into the animals mouth, where it is mixed with saliva and chewed again. When the cud is reswallowed, the partly digested food is further broken down by the cows own enzymes.

Multiple choice biology what do animals eat? digestion in ruminants nutrition in other organisms busy at work - our internal organs

How many chambers present in stomach of ruminating mammals?

  1. Four

  2. Five

  3. Three

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

The ruminant stomach is composed of 4 separate compartments. Food passes first into the 'rumen', then 'reticulum', 'omasum' and finally into the 'abomasum'. The first three compartments helps in digestion of complex carbohydrates with the aid of microorganisms, which produce volatile fatty acids. The abomasum functions similarly to the carnivore stomach as it is glandular and digests food chemically, rather than mechanically or by fermentation like the other 3 chambers of the ruminant stomach. Hence, option A is correct.

Multiple choice biology what do animals eat? digestion in ruminants nutrition in other organisms busy at work - our internal organs

Which of the following is the stomach part in which herbivores secretes the grass which is swallowed quickly?

  1. Lumen

  2. Pyloric

  3. Rumen

  4. Ileum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • The animals which partially digest food have a four-chambered stomach and the process of digestion is as follows: The food is chewed and swallowed quickly and passed into the first stomach called Rumen.
  •  Then the microorganisms help in breaking down the food and this partially digested food is called cud. Hence, the rumen is the stomach part in which herbivores secretes the grass which is swallowed quickly.
So, the correct answer is 'rumen'.

Multiple choice biology what do animals eat? digestion in ruminants nutrition in other organisms busy at work - our internal organs

Partially digested food in ruminants is  

  1. Chyme

  2. Cud

  3. Bolus

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The animals which partially digest food have four chambered stomach and the process of digestion is as follows: The food is chewed and swallowed quickly and passed into the first stomach called Rumen.
  •  So, the animals are referred to as ruminants. Then the microorganisms help in breaking down the food and this partially digested food is called cud. Hence, Partially digested food in ruminants is cud.
So, the correct answer is 'cud'.

Multiple choice biology what do animals eat? digestion in ruminants nutrition in other organisms busy at work - our internal organs

Digestion of food in ruminants takes place with the help of

  1. Virus

  2. Protozoa

  3. Bacteria

  4. Parasite
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The four-chambered stomach of ruminants contain bacteria. The plant material ruminants eat contain cellulose. These bacteria help in the break down of cellulose with the help of enzyme called cellulase.
So the correct answer is 'Bacteria'.
Multiple choice biology what do animals eat? digestion in ruminants nutrition in other organisms busy at work - our internal organs

Which of the following is responsible for partial digestion in the mouth of ruminants?

  1. High intake of cellulose

  2. High intake of lactose

  3. High intake of glucose

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Ruminants eat plant materials that contain cellulose. High intake of cellulose is responsible for partial digestion in the mouth. This partial digestion of cellulose is called cud. It is digested partially in the mouth by the process of regurgitation.
So the correct answer is 'High intake of cellulose'.
Multiple choice biology what do animals eat? digestion in ruminants nutrition in other organisms busy at work - our internal organs

In ruminant stomach, the rumen is the

  1. Largest chamber

  2. Chamber having cellulose fermenting microorganisms

  3. Chamber having villi with cornified surface

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The rumen is the largest chamber of the ruminant stomach and contains a complex ecosystem of microorganisms that ferment cellulose.